JP2019067584A - Power storage element - Google Patents

Power storage element Download PDF

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JP2019067584A
JP2019067584A JP2017190452A JP2017190452A JP2019067584A JP 2019067584 A JP2019067584 A JP 2019067584A JP 2017190452 A JP2017190452 A JP 2017190452A JP 2017190452 A JP2017190452 A JP 2017190452A JP 2019067584 A JP2019067584 A JP 2019067584A
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plate
electrode
positive electrode
storage element
container
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JP7020034B2 (en
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伸介 吉竹
Shinsuke Yoshitake
伸介 吉竹
悟 川上
Satoru Kawakami
悟 川上
広徳 相田
Hironori Aida
広徳 相田
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GS Yuasa Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

To provide a high-quality power storage element that comprises an electrode body having a lamination array in which electrode plates and a separator are laminated.SOLUTION: A power storage element 10 comprises an electrode body 400 that has a lamination array in which a positive electrode plate 410, a negative electrode plate 420, and a separator 480 are laminated. In the power storage element 10, at any position other than both ends in a lamination direction of the lamination array, of the electrode body 400, a plate-like member 440 different from the positive electrode plate 410, the negative electrode plate 420, and the separator 480 is arranged. The plate-like member 440 has a bent part 445 bent in a plate thickness direction.SELECTED DRAWING: Figure 3

Description

本発明は、極板及びセパレータが積層された積層列を有する電極体を備える蓄電素子に関する。   The present invention relates to a storage element including an electrode body having a stacked array in which an electrode plate and a separator are stacked.

従来、複数の極板が積層されることで形成された電極体を備える蓄電素子が広く知られている。例えば、特許文献1には、電槽とその中の極板群との隙間にスペーサが介在されている鉛蓄電池が開示されている。この鉛蓄電池において、スペーサにはその長手方向に沿って波型の曲げぐせが与えられており、当該スペーサは電槽の底部とストラップとの間で波型状態に変形して極板群に加圧接触されている。特許文献1には、上記構造により、自動化ラインに対応できる耐震型の鉛蓄電池が得られる旨が記載されている。   Conventionally, a storage element provided with an electrode body formed by laminating a plurality of electrode plates is widely known. For example, Patent Document 1 discloses a lead storage battery in which a spacer is interposed in a gap between a battery case and an electrode plate group in the battery case. In this lead-acid battery, the spacer is given a corrugated bending along its longitudinal direction, and the spacer is deformed into a corrugated state between the bottom of the battery case and the strap to be added to the plate group It is in pressure contact. Patent Document 1 describes that the above-described structure provides a shock-resistant lead storage battery that can be used for an automation line.

実開平03−077368号公報Japanese Utility Model Publication No. 03-077368

極板がセパレータを介して積層された構造を有する電極体では、例えば、電極体の耐振動性または耐衝撃性の向上の観点から、電極体は、容器内において適度な力によって積層方向に押圧された状態で保持されていることが好ましい。また、電極体が積層方向に押圧されることで、極板の間隔(具体的には正極板と負極板との間隔)が狭められ、このことは、発電効率の向上の観点、または、容器内の容積における電極体の体積の割合の増加(すなわちエネルギー密度の向上)等の観点から有利である。   In an electrode assembly having a structure in which electrode plates are stacked via a separator, for example, from the viewpoint of improving the vibration resistance or impact resistance of the electrode assembly, the electrode assembly is pressed in the stacking direction by an appropriate force in the container. It is preferable to be held in the closed state. In addition, pressing the electrode body in the stacking direction narrows the distance between the electrode plates (specifically, the distance between the positive electrode plate and the negative electrode plate), which is a viewpoint of improving the power generation efficiency or the container It is advantageous from the viewpoint of the increase of the ratio of the volume of the electrode body in the inner volume (ie, the improvement of the energy density).

そこで、例えば上記従来の技術のように、極板群(電極体)の両側に波板状のスペーサを配置することで電極体を押圧することが考えられる。しかしながらこの場合、電極体と容器の側壁との間に波板状のスペーサが配置されるため、例えば、電極体の熱が容器に伝わり難くなり、これにより電極体が温度上昇しやすくなるという問題が生じ得る。また、電極体の両側に配置されるスペーサにより容器内の容積が消費されるため、例えば、エネルギー密度の向上が困難である。さらに、電極体の両側のスペーサが、例えば、電解液の電極体への浸透の妨げとなる可能性もある。   Then, it is possible to press an electrode body by arrange | positioning a wave-like spacer on both sides of an electrode group (electrode body) like the above-mentioned conventional art, for example. However, in this case, since the corrugated plate-like spacer is disposed between the electrode body and the side wall of the container, for example, the heat of the electrode body is less likely to be transmitted to the container, thereby causing the electrode body to easily rise in temperature. Can occur. Further, since the volume in the container is consumed by the spacers disposed on both sides of the electrode body, for example, it is difficult to improve the energy density. Furthermore, the spacers on both sides of the electrode assembly may, for example, hinder the penetration of the electrolyte into the electrode assembly.

本発明は、上記問題に鑑みてなされたものであり、極板及びセパレータが積層された積層列を有する電極体を備える蓄電素子であって、品質の高い蓄電素子を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric storage device including an electrode body having a stacked array in which electrode plates and separators are stacked, and to provide a high quality storage device. .

上記目的を達成するために、本発明の一態様に係る蓄電素子は、極板及びセパレータが積層された積層列を有する電極体を備える蓄電素子であって、前記積層列の積層方向における両端以外のいずれかの位置には、さらに、前記極板及び前記セパレータとは異なる板状部材が配置されており、前記板状部材は、板厚方向に曲がった曲げ部を有する。   In order to achieve the above object, an electricity storage device according to one aspect of the present invention is an electricity storage device including an electrode body having a stacked array in which an electrode plate and a separator are stacked, and other than both ends in the stacked direction of the stacked array Further, a plate-like member different from the electrode plate and the separator is disposed at any position of the plate, and the plate-like member has a bent portion bent in the plate thickness direction.

この構成によれば、極板及びセパレータの積層列に含まれる板状部材に曲げ部が存在することで、例えば、電極体に振動または衝撃が与えられた場合に、板状部材の曲げ部が平らになるように弾性変形することで、振動または衝撃を吸収することができる。また、電極体における積層列の両端以外の位置に板状部材が配置されることで、例えば、板状部材が、電極体から電極体を収容する容器への熱伝導を阻害する可能性が低減される。また、例えば、電極体の積層方向における両側からの電解液の浸透を板状部材が阻害する可能性が低減される。   According to this configuration, the presence of the bent portion in the plate-like member included in the laminated row of the electrode plate and the separator causes, for example, the bent portion of the plate-like member to be vibrated or impacted. By elastic deformation so as to be flat, vibration or impact can be absorbed. Further, by arranging the plate-like member at a position other than both ends of the stacked array in the electrode body, for example, the possibility that the plate-like member obstructs the heat conduction from the electrode body to the container accommodating the electrode body is reduced. Be done. Further, for example, the possibility that the plate-like member inhibits the permeation of the electrolytic solution from both sides in the stacking direction of the electrode body is reduced.

また、曲げ部を有する板状部材によって、電極体に、積層方向における弾性変形能が付加されるため、例えば、電極体の積層方向の幅を縮めながら、電極体を容器に収容することができる。その結果、曲げ部の復元力により、電極体は、積層方向の両側の壁部(容器の壁部)から押圧された状態と実質的に等価な状態となる。これにより、極板の間隔が狭められることによる発電効率の向上、または、容器内の電極体の体積割合の増加によるエネルギー密度の向上等の効果が得られる。このように、本態様に係る蓄電素子は品質が高い蓄電素子である。   Further, since the plate member having the bent portion adds an elastic deformability in the stacking direction to the electrode body, for example, the electrode body can be accommodated in the container while the width in the stacking direction of the electrode body is reduced. . As a result, the electrode body becomes substantially equivalent to the state of being pressed from the wall portions (container wall portions) on both sides in the stacking direction by the restoring force of the bent portion. As a result, effects such as improvement of the power generation efficiency by narrowing the distance between the electrode plates or improvement of energy density by the increase of the volume ratio of the electrode body in the container can be obtained. Thus, the storage element according to this aspect is a storage element with high quality.

また、本発明の一態様に係る蓄電素子において、前記曲げ部は、前記板状部材において、前記板厚方向と直交する方向に複数並んで配置されているとしてもよい。   Further, in the storage element according to one aspect of the present invention, a plurality of the bending portions may be arranged in the direction perpendicular to the plate thickness direction in the plate-like member.

この構成によれば、板状部材を板厚方向(電極体における積層方向)から見た場合に、複数の曲げ部が分散して配置される。これにより、電極体に与えられる振動または衝撃が板状部材によって効率よく吸収される。また、板状部材による、電極体が含む要素に対する押圧力の分散が図られ、例えば、極板の広い範囲を適度な力で押圧することができる。   According to this configuration, when the plate-like member is viewed from the thickness direction (the stacking direction in the electrode body), the plurality of bent portions are distributed and arranged. Thereby, the vibration or impact applied to the electrode body is efficiently absorbed by the plate-like member. Further, the pressing force of the plate-like member on the element included in the electrode body can be dispersed, and for example, a wide range of the electrode plate can be pressed with an appropriate force.

また、本発明の一態様に係る蓄電素子において、前記電極体は、電極体本体と、前記電極体本体から第一方向に突出して設けられた、前記極板の端部が積層されることで形成された集束部とを有し、複数の前記曲げ部は、前記板状部材の、前記電極体本体に対応する部分において、前記第一方向と直交する第二方向に並んで配置されているとしてもよい。   Further, in the storage element according to one aspect of the present invention, the electrode body is formed by stacking an electrode body main body and an end portion of the electrode plate provided so as to protrude from the electrode body main body in a first direction. And a plurality of the bent portions are arranged side by side in a second direction orthogonal to the first direction in a portion corresponding to the electrode body of the plate-like member. It may be

この構成によれば、例えば電極体が押圧されることで、板状部材が、複数の曲げ部が伸ばされるように変形した場合、板状部材では、主として第二方向の幅が長くなる。そのため、例えば、板状部材が第一方向に伸びる場合に生じ得る、板状部材と集束部との干渉の問題が生じ難い。   According to this configuration, for example, when the plate-like member is deformed so as to extend a plurality of bent portions by pressing the electrode body, in the plate-like member, the width in the second direction mainly becomes long. Therefore, for example, the problem of interference between the plate-like member and the focusing portion, which may occur when the plate-like member extends in the first direction, does not easily occur.

また、本発明の一態様に係る蓄電素子において、前記板状部材は、前記集束部に対応する位置に導通部を有するとしてもよい。   Further, in the storage element according to the aspect of the present invention, the plate-like member may have a conductive portion at a position corresponding to the focusing portion.

この構成によれば、集束部の厚み方向(積層列の積層方向)のいずれかの位置に導通部が存在するため、極板の端部を、厚み方向で束ねて導通部に接合することができる。そのため、集束部の電極体本体からの突出量が比較的に短い場合であっても、集束部を導通部に接合することが可能であり、かつ、導通部を介して電極端子と電気的に接続することも可能である。これにより、例えば、電極体を収容する容器内における、蓄電または発電を行う実体的な部分である電極体本体の割合を大きくすることができ、その結果、蓄電素子のエネルギー密度が向上される。つまり、本態様に係る板状部材は、耐振動性または耐衝撃性の向上等の役割の他、エネルギー密度を向上させる役割も担うことができる。   According to this configuration, since the conducting portion exists at any position in the thickness direction of the focusing portion (the stacking direction of the stacked rows), the end portions of the electrode plates may be bundled in the thickness direction and joined to the conducting portion. it can. Therefore, even when the amount of protrusion of the focusing portion from the electrode body main body is relatively short, the focusing portion can be joined to the conductive portion, and electrically connected to the electrode terminal through the conductive portion. It is also possible to connect. Thereby, for example, the ratio of the electrode body main body which is a substantial part for performing storage or power generation can be increased in the container for storing the electrode body, and as a result, the energy density of the storage element is improved. That is, the plate-like member according to the present aspect can also play a role of improving energy density, in addition to the role of improving vibration resistance or impact resistance.

また、本発明の一態様に係る蓄電素子では、前記板状部材において、前記導通部と、前記複数の前記曲げ部との間に、切断部が形成されているとしてもよい。   Further, in the storage element according to one aspect of the present invention, in the plate-like member, a cutting portion may be formed between the conductive portion and the plurality of bent portions.

この構成によれば、例えば、板状部材の、複数の曲げ部が配置された部分と、導通部が配置された部分との間に、不連続な部分(切断部)が存在する。そのため、複数の曲げ部が配置された部分における伸縮が、導通部の位置を移動させるように作用する可能性が低減する。つまり、板状部材の、振動または衝撃の吸収等の機能、及び、導通部を支持する機能の双方の実効性が向上する。   According to this configuration, for example, there is a discontinuous portion (cut portion) between the portion of the plate member in which the plurality of bent portions are disposed and the portion in which the conductive portion is disposed. Therefore, the possibility that expansion and contraction in the portion where the plurality of bent portions are disposed acts to move the position of the conductive portion. That is, the effectiveness of both the function of absorbing the vibration or impact and the function of supporting the conduction portion of the plate-like member is improved.

本発明によれば、極板及びセパレータが積層された積層列を有する電極体を備える蓄電素子であって、品質の高い蓄電素子を提供することができる。   According to the present invention, it is an electricity storage element provided with an electrode assembly having a stacked array in which electrode plates and separators are stacked, and it is possible to provide a high quality power storage element.

実施の形態に係る蓄電素子の外観を示す斜視図である。It is a perspective view which shows the external appearance of the electrical storage element which concerns on embodiment. 実施の形態に係る蓄電素子の分解斜視図である。It is a disassembled perspective view of the electrical storage element which concerns on embodiment. 実施の形態に係る電極体の構成概要を示す斜視図である。It is a perspective view which shows the structure outline | summary of the electrode body which concerns on embodiment. 実施の形態に係る板状部材の横断面図である。It is a cross-sectional view of the plate-shaped member which concerns on embodiment. 実施の形態に係る第一導通部に正極集束部が接合された状態を示す側面図である。It is a side view showing the state where the positive electrode focusing part was joined to the first conduction part concerning an embodiment. 実施の形態に係る第一導通部と正極端子との接合箇所を示す部分断面図である。It is a fragmentary sectional view which shows the junction part of the 1st conduction | electrical_connection part which concerns on embodiment, and a positive electrode terminal. 実施の形態の変形例1に係る板状部材の構成を示す斜視図である。It is a perspective view which shows the structure of the plate-shaped member which concerns on the modification 1 of embodiment. 実施の形態の変形例2に係る板状部材の構成を示す斜視図である。It is a perspective view which shows the structure of the plate-shaped member which concerns on the modification 2 of embodiment.

以下、図面を参照しながら、本発明の実施の形態及びその変形例に係る蓄電素子について説明する。なお、以下で説明する実施の形態及びその変形例は、いずれも包括的または具体的な例を示すものである。以下の実施の形態及びその変形例で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、製造工程、製造工程の順序などは、一例であり、本発明を限定する主旨ではない。また、以下の実施の形態及びその変形例における構成要素のうち、最上位概念を示す独立請求項に記載されていない構成要素については、任意の構成要素として説明される。また、各図は、模式図であり、寸法等は必ずしも厳密に図示したものではない。   Hereinafter, a storage element according to an embodiment of the present invention and a modification thereof will be described with reference to the drawings. Note that the embodiment described below and the modifications thereof all show a comprehensive or specific example. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing processes, order of manufacturing processes, etc. shown in the following embodiment and the modification thereof are merely examples, and the present invention is limited. is not. Further, among the components in the following embodiment and the variation thereof, components not described in the independent claim indicating the highest concept are described as optional components. Further, each drawing is a schematic view, and the dimensions and the like are not necessarily illustrated exactly.

また、以下の説明及び図面中において、蓄電素子が有する一対の電極端子の並び方向、電極体の一対の集束部の並び方向、または、容器の短側面の対向方向をX軸方向と定義する。また、容器の長側面の対向方向、容器の短側面の短手方向、容器の厚さ方向、または、電極体の極板の積層方向をY軸方向と定義する。また、蓄電素子の容器本体と蓋との並び方向、容器の短側面の長手方向、電極端子の軸部の軸方向、または、上下方向をZ軸方向と定義する。これらX軸方向、Y軸方向及びZ軸方向は、互いに交差(本実施の形態では直交)する方向である。なお、使用態様によってはZ軸方向が上下方向にならない場合も考えられるが、以下では説明の便宜のため、Z軸方向を上下方向として説明する。また、以下の説明において、例えば、X軸方向プラス側とは、X軸の矢印方向側を示し、X軸方向マイナス側とは、X軸方向プラス側とは反対側を示す。Y軸方向やZ軸方向についても同様である。   In the following description and the drawings, the direction in which the pair of electrode terminals of the storage element is aligned, the direction in which the pair of focusing portions of the electrode assembly is aligned, or the opposing direction of the short side of the container is defined as the X axis direction. Further, the opposing direction of the long side of the container, the lateral direction of the short side of the container, the thickness direction of the container, or the laminating direction of the electrode plates of the electrode assembly is defined as the Y-axis direction. In addition, the direction in which the container body and the lid of the storage element are aligned, the longitudinal direction of the short side of the container, the axial direction of the shaft of the electrode terminal, or the vertical direction is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are directions intersecting with each other (orthogonal in the present embodiment). Although it may be considered that the Z-axis direction is not in the vertical direction depending on the mode of use, the Z-axis direction is hereinafter described as the vertical direction for the convenience of description. Further, in the following description, for example, the X axis direction plus side indicates the arrow direction side of the X axis, and the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

(実施の形態)
[1.蓄電素子の全般的な説明]
まず、図1及び図2を用いて、本実施の形態における蓄電素子10の全般的な説明を行う。図1は、実施の形態に係る蓄電素子10の外観を示す斜視図である。また、図2は、実施の形態に係る蓄電素子10の分解斜視図である。
Embodiment
[1. General Description of Storage Element]
First, general description of the storage element 10 according to the present embodiment will be given using FIGS. 1 and 2. FIG. 1 is a perspective view showing an appearance of a storage element 10 according to the embodiment. FIG. 2 is an exploded perspective view of power storage element 10 according to the embodiment.

蓄電素子10は、電気を充電し、また、電気を放電することのできる二次電池であり、具体的には、リチウムイオン二次電池などの非水電解質二次電池である。蓄電素子10は、例えば、電気自動車(EV)、ハイブリッド電気自動車(HEV)またはプラグインハイブリッド電気自動車(PHEV)等の自動車用(または移動体用)電源、電子機器用電源、または電力貯蔵用電源などに適用される。なお、蓄電素子10は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。蓄電素子10は、使用者が充電をしなくても蓄えられている電気を使用できる一次電池であってもよい。また、蓄電素子10は、固体電解質を用いた電池であってもよい。   The storage element 10 is a secondary battery capable of charging and discharging electricity, and specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The storage element 10 is, for example, an automotive (or mobile) power supply such as an electric vehicle (EV), a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV), a power supply for electronic devices, or a power supply for power storage. It applies to etc. The storage element 10 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor. The storage element 10 may be a primary battery that can use the stored electricity without charging by the user. In addition, the storage element 10 may be a battery using a solid electrolyte.

これらの図に示すように、蓄電素子10は、容器100と、電極体400と、正極端子200と、負極端子300と、上ガスケット500と、上ガスケット600とを備えている。また、蓄電素子10の容器100の内部には電解液(非水電解質)が封入されているが、図示は省略する。なお、容器100に封入される電解液としては、蓄電素子10の性能を損なうものでなければその種類に特に制限はなく、様々なものを選択することができる。   As shown in these figures, the storage element 10 includes a container 100, an electrode assembly 400, a positive electrode terminal 200, a negative electrode terminal 300, an upper gasket 500, and an upper gasket 600. Moreover, although the electrolyte solution (non-aqueous electrolyte) is enclosed in the inside of the container 100 of the electrical storage element 10, illustration is abbreviate | omitted. The type of the electrolytic solution sealed in the container 100 is not particularly limited as long as it does not impair the performance of the storage element 10, and various types can be selected.

容器100は、矩形筒状で底を備える容器本体110と、容器本体110の開口を閉塞する蓋板120とで構成されている。容器100は、電極体400等を内部に収容後、蓋板120と容器本体110とが溶接等されることにより、内部を密封する構造を有している。また、容器100(蓋板120及び容器本体110)は、例えば、ステンレス鋼、アルミニウム、またはアルミニウム合金などの溶接可能な金属で形成されている。なお、蓋板120と容器本体110とは、同じ材質で形成されているのが好ましいが、異なる材質で形成されていてもかまわない。また、蓋板120には、容器100内部に電解液を注入するための注液部や、容器100の内圧が上昇したときに容器100内部のガスを排出するガス排出弁等が配置されていてもよい。   The container 100 includes a container body 110 having a rectangular cylindrical bottom and a lid 120 for closing the opening of the container body 110. The container 100 has a structure in which the inside is sealed by welding the lid plate 120 and the container body 110 after the electrode body 400 and the like are accommodated therein. Further, the container 100 (the lid plate 120 and the container body 110) is formed of, for example, a weldable metal such as stainless steel, aluminum, or an aluminum alloy. The lid plate 120 and the container body 110 are preferably formed of the same material, but may be formed of different materials. In addition, a liquid injection portion for injecting an electrolytic solution into the inside of the container 100, a gas discharge valve for discharging the gas in the container 100 when the internal pressure of the container 100 rises, and the like are arranged on the lid plate 120. It is also good.

電極体400は、正極板と負極板とセパレータとを備え、電気を蓄えることができる蓄電要素(発電要素)であり、容器100の内方に配置される。具体的には、電極体400は、正極板と負極板とがセパレータを挟んで交互に並べられた積層型の電極体である。つまり、電極体400は、正極板410、負極板420及びセパレータ480が積層された積層列を有している。電極体400は、発電及び蓄電する部分である電極体本体401と、電極体本体401と外部との電力のやり取りを行う部分である正極集束部415及び負極集束部425とを有する。   The electrode assembly 400 includes a positive electrode plate, a negative electrode plate, and a separator, and is a storage element (power generation element) capable of storing electricity, and is disposed inside the container 100. Specifically, the electrode assembly 400 is a stacked electrode assembly in which a positive electrode plate and a negative electrode plate are alternately arranged with a separator interposed therebetween. That is, the electrode body 400 has a stacked array in which the positive electrode plate 410, the negative electrode plate 420, and the separator 480 are stacked. The electrode assembly 400 includes an electrode assembly main body 401 which is a part that generates and stores electric power, and a positive electrode focusing part 415 and a negative electrode focusing part 425 which are parts that exchange power between the electrode assembly main body 401 and the outside.

また、本実施の形態では、電極体400における積層列の両端以外のいずれかの位置に板状部材440が配置されている。板状部材440は、第一導通部450及び第二導通部460を有し、第一導通部450には正極集束部415が接合され、第二導通部460には負極集束部425が接合されている。さらに、第一導通部450は、正極端子200と接合され、第二導通部460は、負極端子300と接合されている。これにより、電極体400は、正極端子200及び負極端子300を介して、外部の装置等との間で電力のやり取りを行うことができる。板状部材440及び電極体400の構成については図3〜図6を用いて後述する。   Further, in the present embodiment, the plate-like member 440 is disposed at any position other than the both ends of the stacked array in the electrode body 400. The plate-like member 440 has a first conductive portion 450 and a second conductive portion 460, the positive electrode focusing portion 415 is bonded to the first conductive portion 450, and the negative electrode focusing portion 425 is bonded to the second conductive portion 460. ing. Furthermore, the first conduction portion 450 is joined to the positive electrode terminal 200, and the second conduction portion 460 is joined to the negative electrode terminal 300. Thus, the electrode assembly 400 can exchange power with an external device or the like through the positive electrode terminal 200 and the negative electrode terminal 300. The configurations of the plate member 440 and the electrode assembly 400 will be described later with reference to FIGS. 3 to 6.

上ガスケット500及び600は、容器100の蓋板120と正極端子200及び負極端子300との間に配置される絶縁性の封止部材である。上ガスケット500及び600は、例えば、ポリプロピレン(PP)、ポリエチレン(PE)、または、ポリフェニレンサルファイド樹脂(PPS)等の樹脂などによって形成されている。なお、蓋板120を挟んで上ガスケット500及び600それぞれに対向する位置には下ガスケットが配置されている。上ガスケット500及びその周辺の構造については、図6を用いて後述する。   The upper gaskets 500 and 600 are insulating sealing members disposed between the lid plate 120 of the container 100 and the positive electrode terminal 200 and the negative electrode terminal 300. The upper gaskets 500 and 600 are made of, for example, a resin such as polypropylene (PP), polyethylene (PE), or polyphenylene sulfide resin (PPS). A lower gasket is disposed at a position facing the upper gaskets 500 and 600 with the lid plate 120 interposed therebetween. The upper gasket 500 and the structure around it will be described later with reference to FIG.

正極端子200及び負極端子300は、電極体400の正極板及び負極板に電気的に接続される部材である。つまり、正極端子200及び負極端子300は、電極体400に蓄えられている電気を蓄電素子10の外部空間に導出し、また、電極体400に電気を蓄えるために蓄電素子10の内部空間に電気を導入するための金属製の部材である。例えば、正極端子200は、アルミニウムまたはアルミニウム合金などで形成され、負極端子300は、銅または銅合金などで形成されている。また、正極端子200は上ガスケット500を介して蓋板120に固定されており、負極端子300は、上ガスケット600を介して蓋板120に固定されている。   The positive electrode terminal 200 and the negative electrode terminal 300 are members electrically connected to the positive electrode plate and the negative electrode plate of the electrode assembly 400. That is, positive electrode terminal 200 and negative electrode terminal 300 lead the electricity stored in electrode assembly 400 to the external space of storage element 10, and the electricity in the internal space of storage device 10 for storing electricity in electrode assembly 400. It is a metal member for introducing For example, the positive electrode terminal 200 is formed of aluminum or an aluminum alloy or the like, and the negative electrode terminal 300 is formed of copper or a copper alloy or the like. Further, the positive electrode terminal 200 is fixed to the lid plate 120 via the upper gasket 500, and the negative electrode terminal 300 is fixed to the lid plate 120 via the upper gasket 600.

[2.電極体及び板状部材の構成]
次に、本実施の形態に係る電極体400及び板状部材440の構成について、図3〜図6を用いて説明する。
[2. Configuration of electrode body and plate-like member]
Next, configurations of the electrode body 400 and the plate member 440 according to the present embodiment will be described using FIGS. 3 to 6.

図3は、実施の形態に係る電極体400の構成概要を示す斜視図である。なお、図3では、電極体400の極板等の構成要素が視認しやすいように、各構成要素を離し、かつ、各構成要素の厚みを大きくするなどの加工がなされている。このことは、後述する図5にも適用される。図4は、実施の形態に係る板状部材440の横断面図である。具体的には、図4では、図3のIV−IV線を通るXY平面における板状部材440の断面が示されている。   FIG. 3 is a perspective view showing an outline of the configuration of the electrode assembly 400 according to the embodiment. In addition, in FIG. 3, in order to make components, such as the electrode plate of the electrode body 400, easy to visually recognize, each component is processed and processing of enlarging thickness of each component is made. This applies to FIG. 5 described later. FIG. 4 is a cross-sectional view of a plate-like member 440 according to the embodiment. Specifically, FIG. 4 shows a cross section of the plate member 440 in the XY plane passing through the IV-IV line of FIG. 3.

図5は、実施の形態に係る第一導通部450に正極集束部415が接合された状態を示す側面図(X軸方向から見た場合の図)である。なお、図5では、正極板410は、太線の実線で表されており、負極板420は太線の点線で表されている。   FIG. 5 is a side view (as viewed from the X-axis direction) showing a state in which the positive electrode focusing portion 415 is joined to the first conducting portion 450 according to the embodiment. In FIG. 5, the positive electrode plate 410 is represented by a thick solid line, and the negative electrode plate 420 is represented by a thick dotted line.

図3及び図5に示すように、本実施の形態に係る電極体400は、正極板410及び負極板420がセパレータ480を介して積層されることで形成されている。   As shown in FIGS. 3 and 5, the electrode assembly 400 according to the present embodiment is formed by laminating a positive electrode plate 410 and a negative electrode plate 420 with a separator 480 interposed therebetween.

正極板410は、アルミニウムまたはアルミニウム合金などからなる平板状かつ矩形状の基材層と、基材層の表面に形成された正極活物質層とを有している。また、正極板410は、Z軸方向プラス側に突出した端部を有している。当該端部は正極活物質層が形成されていない活物質層非形成部であり、以下、正極タブ411という。   The positive electrode plate 410 has a flat and rectangular base material layer made of aluminum or aluminum alloy or the like, and a positive electrode active material layer formed on the surface of the base material layer. In addition, the positive electrode plate 410 has an end that protrudes to the positive side in the Z-axis direction. The end portion is an active material layer non-formed portion where the positive electrode active material layer is not formed, and hereinafter, referred to as a positive electrode tab 411.

負極板420は、銅または銅合金などからなる平板状かつ矩形状の基材層と、基材層の表面に形成された負極活物質層とを有している。また、負極板420は、Z軸方向プラス側に突出した端部を有している。当該端部は負極活物質層が形成されていない活物質層非形成部であり、以下、負極タブ421という。なお、負極タブ421は、X軸方向において、正極タブ411とは異なる位置に設けられている。   The negative electrode plate 420 has a flat and rectangular base material layer made of copper or copper alloy or the like, and a negative electrode active material layer formed on the surface of the base material layer. The negative electrode plate 420 also has an end that protrudes to the positive side in the Z-axis direction. The end portion is an active material layer non-formed portion where the negative electrode active material layer is not formed, and is hereinafter referred to as a negative electrode tab 421. The negative electrode tab 421 is provided at a position different from the positive electrode tab 411 in the X-axis direction.

電極体400の正極集束部415は、複数の正極板410の端部(正極タブ411)が積層されることで形成されており、電極体400の負極集束部425は、複数の負極板420の端部(負極タブ421)が積層されることで形成されている。なお、正極集束部415及び負極集束部425の、電極体本体401からの突出方向(本実施の形態ではZ軸方向プラス側)は第一方向の一例である。   The positive electrode focusing portion 415 of the electrode body 400 is formed by stacking the end portions (positive electrode tabs 411) of the plurality of positive electrode plates 410, and the negative electrode focusing portion 425 of the electrode body 400 is formed of the plurality of negative electrode plates 420. It is formed by laminating | stacking the edge part (negative electrode tab 421). The direction in which the positive electrode focusing portion 415 and the negative electrode focusing portion 425 protrude from the electrode body main body 401 (in the present embodiment, the Z-axis direction plus side) is an example of a first direction.

また電極体400の積層列にはさらに、積層方向の両端以外の位置に、正極板410、負極板420及びセパレータ480とは異なる板状部材440が配置されている。本実施の形態では、Y軸方向に並ぶ積層列における略中央位置に板状部材440が配置されている。なお、板状部材440を含む電極体400の最外周は、例えば、一周以上巻かれた図示しない絶縁シート(例えセパレータ480と同じ素材の長尺状のシート)で形成されている。つまり、正極板410、負極板420及びセパレータ480からなる積層列及び当該積層列に含まれる板状部材440は、絶縁シートで巻かれることで固定されている。   Further, in the lamination row of the electrode body 400, a plate-like member 440 different from the positive electrode plate 410, the negative electrode plate 420, and the separator 480 is disposed at a position other than both ends in the lamination direction. In the present embodiment, the plate-like member 440 is disposed at a substantially central position in the stacked rows arranged in the Y-axis direction. The outermost periphery of the electrode body 400 including the plate-like member 440 is formed of, for example, a not-shown insulating sheet (for example, a long sheet made of the same material as the separator 480) wound one round or more. That is, the laminated row consisting of the positive electrode plate 410, the negative electrode plate 420 and the separator 480 and the plate-like member 440 included in the laminated row are fixed by being wound with the insulating sheet.

板状部材440は、図3〜図5に示すように、PP、PE、またはPPS等の樹脂によって形成された本体部441と、電極体400の正極集束部415に対応する位置に配置された第一導通部450、及び、電極体400の負極集束部425に対応する位置に配置された第二導通部460とを有する。具体的には、第一導通部450及び第二導通部460のそれぞれは、本体部441のZ軸方向プラス側の端縁である上端縁442に取り付けられている。   The plate-like member 440 is disposed at a position corresponding to the main body portion 441 formed of a resin such as PP, PE, or PPS, and the positive electrode focusing portion 415 of the electrode body 400, as shown in FIGS. The first conductive portion 450 and a second conductive portion 460 disposed at a position corresponding to the negative electrode focusing portion 425 of the electrode body 400 are provided. Specifically, each of the first conductive portion 450 and the second conductive portion 460 is attached to an upper end edge 442 which is an end edge on the Z axis direction plus side of the main body portion 441.

電極体400の正極集束部415は、第一導通部450と接合され、電極体400の負極集束部425は第二導通部460と接合されている。具体的には、例えば図5に示すように、第一導通部450の両側面に、正極集束部415が寄せ集められた状態で、正極集束部415が第一導通部450に接合される。なお、接合の手法に特に限定はなく、例えば超音波接合、抵抗溶接、及びかしめ接合等が採用される。   The positive electrode focusing portion 415 of the electrode body 400 is joined to the first conducting portion 450, and the negative electrode focusing portion 425 of the electrode body 400 is joined to the second conducting portion 460. Specifically, for example, as shown in FIG. 5, the positive electrode focusing portion 415 is joined to the first conductive portion 450 in a state in which the positive electrode focusing portion 415 is gathered to the both side surfaces of the first conductive portion 450. In addition, there is no limitation in particular in the method of joining, For example, ultrasonic joining, resistance welding, caulking joining etc. are employ | adopted.

このように、第一導通部450に正極集束部415が接合されることで、第一導通部450は、電極体400が有する正極側の端子として機能する。具体的には、第一導通部450は第一方向(Z軸方向プラス側)の端部に導電部材が接続される接続部451を有している。本実施の形態では、第一導通部450のZ軸方向プラス側の端面が、導電部材の一例である正極端子200と接合される接続部451として機能する。なお、第一導通部450と正極端子200との接合箇所については、図6を用いて後述する。   As described above, when the positive electrode focusing portion 415 is joined to the first conductive portion 450, the first conductive portion 450 functions as a positive electrode side terminal of the electrode assembly 400. Specifically, the first conducting portion 450 has a connecting portion 451 to which a conductive member is connected at an end portion in the first direction (plus side in the Z-axis direction). In the present embodiment, the end surface on the positive side in the Z-axis direction of the first conduction portion 450 functions as the connection portion 451 joined to the positive electrode terminal 200 which is an example of the conductive member. The junction between the first conducting portion 450 and the positive electrode terminal 200 will be described later with reference to FIG.

ここで、極板がセパレータを介して積層された構造を有する電極体では、上述のように、電極体の耐振動性または耐衝撃性の向上の観点から、電極体は、容器内において適度な力によって積層方向に押圧された状態で保持されていることが好ましい。この点に関し、長尺帯状の極板がセパレータを介して積層され、かつ、巻回されることで形成された巻回型の電極体であれば、湾曲部が存在することで、押圧に対する柔軟性を有している。具体的には、巻回型の電極体における一対の湾曲部の間の平坦部を、巻回軸と直交する方向の両側から押圧した場合、湾曲部が幅を狭めるように変形することで電極体の全体が弾性変形する。従って、その状態で電極体を容器に収容することで、少なくとも平坦部における極板の間隔が狭められた状態で電極体が容器に保持される。   Here, in the electrode body having a structure in which the electrode plates are stacked via the separator, as described above, from the viewpoint of improving the vibration resistance or impact resistance of the electrode body, the electrode body is appropriate in the container It is preferable to hold | maintain in the state pressed in the lamination direction by force. In this regard, in the case of a wound-type electrode body in which long strip-like electrode plates are stacked via a separator and wound, the presence of a curved portion makes the electrode flexible against pressure. Have sex. Specifically, when a flat portion between a pair of curved portions in a wound electrode body is pressed from both sides in a direction orthogonal to the winding axis, the curved portion is deformed so as to narrow the width. The entire body is elastically deformed. Therefore, by accommodating the electrode body in the container in that state, the electrode body is held by the container with the distance between the electrode plates at least at the flat portion being narrowed.

しかしながら、本実施の形態に係る電極体400のような積層型の電極体の場合、積層方向における弾性には期待できないため、例えば積層方向に押圧することで幅を縮めながら容器に収容することに有意性はなく、かつ、技術的にも困難である。また、電極体の積層方向の幅と略同一の幅を有する容器に電極体を収容することで、容器内における電極体の体積割合を向上させることは可能であるが、この場合、例えば、収容作業において。容器の開口の縁で電極体を傷つけやすいという問題が生じる。また、上記従来の技術のように、電極体と容器の側壁との間にスペーサを配置した場合、上述のように、放熱性の低下等の問題が生じ得る。   However, in the case of a stacked electrode assembly such as the electrode assembly 400 according to the present embodiment, since elasticity in the stacking direction can not be expected, for example, the container is accommodated in a container while reducing its width by pressing in the stacking direction. It has no significance and is technically difficult. In addition, it is possible to improve the volume ratio of the electrode assembly in the container by housing the electrode assembly in a container having a width substantially the same as the width of the electrode assembly in the stacking direction, but in this case, for example, In work. There is a problem that the electrode body is easily damaged at the edge of the opening of the container. In addition, when the spacer is disposed between the electrode body and the side wall of the container as in the above-mentioned prior art, as described above, problems such as a decrease in heat dissipation may occur.

そこで、本実施の形態に係る蓄電素子10では、電極体400の積層列に含まれる板状部材440によって、電極体400に積層方向の弾性変形能を付加する構成が採用されている。具体的には、板状部材440は、図3及び図4に示すように、板厚方向(本実施の形態ではY軸方向)に曲がった曲げ部445を有している。板状部材440は上述のように、例えば樹脂により形成されており、曲げ部445は、板厚方向に押圧された場合、平らになるように弾性変形することができる。   Therefore, in the storage element 10 according to the present embodiment, a configuration is adopted in which elastic deformability in the stacking direction is added to the electrode body 400 by the plate-like member 440 included in the stacked array of the electrode body 400. Specifically, as shown in FIGS. 3 and 4, the plate-like member 440 has a bent portion 445 bent in the plate thickness direction (the Y-axis direction in the present embodiment). As described above, the plate-like member 440 is made of, for example, a resin, and the bending portion 445 can be elastically deformed so as to be flat when pressed in the plate thickness direction.

つまり、本実施の形態に係る蓄電素子10は、正極板410、負極板420、及びセパレータ480が積層された積層列を有する電極体400を備える。この蓄電素子10において、電極体400の積層列の積層方向における両端以外のいずれかの位置には、さらに正極板410、負極板420、及びセパレータ480とは異なる板状部材440が配置されている。板状部材440は、板厚方向に曲がった曲げ部445を有する。   That is, the storage element 10 according to the present embodiment includes the electrode assembly 400 having a stacked array in which the positive electrode plate 410, the negative electrode plate 420, and the separator 480 are stacked. In the storage element 10, a plate-like member 440 different from the positive electrode plate 410, the negative electrode plate 420, and the separator 480 is disposed at any position other than both ends in the stacking direction of the stacked rows of the electrode body 400. . The plate member 440 has a bent portion 445 bent in the plate thickness direction.

この構成によれば、電極体400の積層列に含まれる板状部材440に曲げ部445が存在することで、例えば、電極体400に振動または衝撃が与えられた場合に、板状部材440の曲げ部445が平らになるように弾性変形することで、振動または衝撃を吸収することができる。言い換えると、板状部材440は積層列に含まれる部分(本体部441)の厚みを変化させるように弾性変形することで、振動または衝撃を吸収することができる。また、電極体400における積層列の両端以外の位置に板状部材440が配置されることで、例えば、板状部材440が、電極体400から容器100への熱伝導を阻害する可能性が低減される。これにより、電極体400の熱を、容器100を介して外部に効率よく放出することができる。また、例えば、電極体400の積層方向における両側からの電解液の浸透を板状部材440が阻害する可能性が低減される。   According to this configuration, the presence of the bending portion 445 in the plate-like member 440 included in the stacked row of the electrode body 400 allows, for example, vibration or impact of the electrode body 400 when the plate-like member 440 is By elastically deforming the bent portion 445 so as to be flat, vibration or impact can be absorbed. In other words, the plate-like member 440 can absorb vibration or impact by being elastically deformed so as to change the thickness of the portion (the main body portion 441) included in the stacked row. Further, by arranging the plate-like member 440 at a position other than both ends of the stacked array in the electrode body 400, for example, the possibility that the plate-like member 440 impedes the heat conduction from the electrode body 400 to the container 100 is reduced. Be done. Thereby, the heat of the electrode assembly 400 can be efficiently released to the outside through the container 100. Further, for example, the possibility that the plate member 440 inhibits the penetration of the electrolytic solution from both sides in the stacking direction of the electrode body 400 is reduced.

また、曲げ部445を有する板状部材440によって、積層型の電極体400に、積層方向における弾性変形能が付加されるため、例えば、電極体400の積層方向の幅を縮めながら、電極体400を容器100に収容することができる。その結果、伸ばされた曲げ部445の復元力により、電極体400は、積層方向の両側の壁部(容器100のY軸方向の壁部)から押圧された状態と実質的に等価な状態となる。これにより、例えば正極板410と負極板420との間隔が狭められることによる発電効率の向上、または、容器100内の電極体400の体積割合の増加によるエネルギー密度の向上等の効果が得られる。このように、本態様に係る蓄電素子10は品質が高い蓄電素子である。   Further, since the elastic deformability in the stacking direction is added to the stacked electrode assembly 400 by the plate-like member 440 having the bent portion 445, for example, the electrode assembly 400 is shrunk while the width in the stacking direction is reduced. Can be contained in the container 100. As a result, the electrode body 400 is substantially equivalent to a state in which the electrode body 400 is pressed from the walls on both sides in the stacking direction (the wall of the container 100 in the Y axis direction) by the restoring force of the extended bending portion 445. Become. As a result, for example, the effect of improving the power generation efficiency by narrowing the distance between the positive electrode plate 410 and the negative electrode plate 420 or improving the energy density by increasing the volume ratio of the electrode assembly 400 in the container 100 can be obtained. Thus, the storage element 10 according to this aspect is a storage element with high quality.

より具体的には、本実施の形態に係る蓄電素子10において、曲げ部445は、板状部材440において、板厚方向と直交する方向に複数並んで配置されている。   More specifically, in power storage element 10 according to the present embodiment, in plate member 440, a plurality of bent portions 445 are arranged in the direction orthogonal to the plate thickness direction.

すなわち、本実施の形態では、板状部材440を板厚方向(電極体400における積層方向)から見た場合に、複数の曲げ部445が分散して配置されている。これにより、電極体400に与えられる振動または衝撃が板状部材440によって効率よく吸収される。また、板状部材440による、電極体400が含む要素(正極板410、負極板420、及びセパレータ480)に対する押圧力の分散が図られ、例えば、正極板410及び負極板420の広い範囲を適度な力で押圧することができる。   That is, in the present embodiment, when the plate-like member 440 is viewed from the thickness direction (the stacking direction of the electrode assembly 400), the plurality of bent portions 445 are dispersedly arranged. Thereby, the vibration or impact applied to the electrode body 400 is efficiently absorbed by the plate member 440. Further, the pressing force can be dispersed by the plate member 440 against the elements (the positive electrode plate 410, the negative electrode plate 420, and the separator 480) included in the electrode body 400. For example, the wide range of the positive electrode plate 410 and the negative electrode plate 420 Can be pressed with

また、本実施の形態では、板状部材440の本体部441において、曲げ部445が連続して形成されていることで、本体部441は波板の形状を有している。また、複数の曲げ部445の並び方向は、例えば正極集束部415の突出方向と直交する方向である。   Further, in the present embodiment, the bending portion 445 is continuously formed in the main body portion 441 of the plate-like member 440, whereby the main body portion 441 has the shape of a corrugated plate. Further, the alignment direction of the plurality of bent portions 445 is, for example, a direction orthogonal to the protruding direction of the positive electrode focusing portion 415.

つまり、本実施の形態に係る蓄電素子10において、電極体400は、電極体本体401と、電極体本体401から第一方向に突出して設けられた、正極タブ411が積層されることで形成された正極集束部415とを有する。複数の曲げ部445は、板状部材440の、電極体本体401に対応する部分において、第一方向と直交する第二方向に並んで配置されている。なお、本実施の形態では、第一方向は、Z軸方向プラス側であり、第二方向は、X軸方向プラス側またはマイナス側である。つまり、本実施の形態において、複数の曲げ部445が並ぶことで形成された波形状における稜線及び谷線は、第一方向と平行である。   That is, in the storage element 10 according to the present embodiment, the electrode assembly 400 is formed by stacking the electrode assembly main body 401 and the positive electrode tab 411 provided so as to protrude from the electrode assembly main body 401 in the first direction. And a positive electrode focusing portion 415. The plurality of bent portions 445 are arranged side by side in a second direction orthogonal to the first direction in a portion of the plate-like member 440 corresponding to the electrode body 401. In the present embodiment, the first direction is the plus side in the Z-axis direction, and the second direction is the plus side or the minus side in the X-axis direction. That is, in the present embodiment, ridges and valleys in the wave shape formed by arranging the plurality of bent portions 445 are parallel to the first direction.

この構成によれば、例えば電極体400が押圧されることで、板状部材440が、複数の曲げ部445が伸ばされるように変形した場合、板状部材440は、主として第二方向(X軸方向)の幅が長くなる。そのため、例えば、板状部材440が第一方向に伸びる場合に生じ得る、板状部材440と正極集束部415との干渉の問題が生じ難い。   According to this configuration, for example, when the plate-like member 440 is deformed so as to extend the plurality of bent portions 445 by the electrode body 400 being pressed, the plate-like member 440 is mainly in the second direction (X axis The width of the direction becomes longer. Therefore, for example, the problem of interference between the plate-like member 440 and the positive electrode focusing portion 415, which may occur when the plate-like member 440 extends in the first direction, does not easily occur.

また、本実施の形態に係る板状部材440は、曲げ部445を有することによる、振動または衝撃の吸収、及び、極板の押圧等の役割の他、導通部を支持する役割も担っている。   Further, the plate-like member 440 according to the present embodiment also plays a role of supporting the conduction portion in addition to the role of absorbing vibration or impact and pressing the electrode plate by having the bending portion 445. .

具体的には、本態様に係る蓄電素子10において、板状部材440は、正極集束部415に対応する位置に第一導通部450を有している。   Specifically, in the storage element 10 according to this aspect, the plate-like member 440 has the first conducting portion 450 at a position corresponding to the positive electrode focusing portion 415.

このように、本実施の形態では、正極集束部415の厚み方向(積層列の積層方向)のいずれかの位置に第一導通部450が存在するため、正極タブ411を、厚み方向で束ねて第一導通部450と接合することができる。そのため、正極集束部415の電極体本体401からの突出量が比較的に短い場合であっても、正極集束部415を第一導通部450に接合することが可能であり、かつ、第一導通部450を介して正極端子200と電気的に接続することができる。これにより、例えば、容器100内における、蓄電または発電を行う実体的な部分である電極体本体401の割合を大きくすることができ、その結果、蓄電素子10のエネルギー密度が向上される。つまり、本実施の形態に係る板状部材440は、耐振動性または耐衝撃性の向上等の役割の他、エネルギー密度を向上させる役割も担うことができる。従って、本実施の形態に係る蓄電素子10は、例えば、振動または衝撃が与えられやすい環境に置かれる、自動車等の移動体に搭載される蓄電素子であって、小型化と大出力とを求められる蓄電素子として好適である。   As described above, in the present embodiment, since the first conductive portion 450 exists at any position in the thickness direction of the positive electrode focusing portion 415 (the stacking direction of the stacked rows), the positive electrode tabs 411 are bundled in the thickness direction. It can be joined to the first conducting part 450. Therefore, even when the amount of protrusion of the positive electrode focusing portion 415 from the electrode body main body 401 is relatively short, the positive electrode focusing portion 415 can be joined to the first conducting portion 450, and the first conduction is achieved. It can be electrically connected to the positive electrode terminal 200 through the portion 450. Thereby, for example, the ratio of the electrode body main body 401 which is a substantial part for performing storage or power generation in the container 100 can be increased, and as a result, the energy density of the storage element 10 is improved. That is, the plate-like member 440 according to the present embodiment can also play a role of improving energy density, in addition to the role of improving vibration resistance or impact resistance. Therefore, the storage element 10 according to the present embodiment is, for example, a storage element mounted on a mobile object such as an automobile, which is placed in an environment susceptible to vibration or shock, and is required to be smaller and have a large output. Is suitable as a power storage device.

より詳細には、本実施の形態において、板状部材440が有する本体部441は、第一導通部450から、電極体400の、正極集束部415とは反対側の端部まで延設されている。   More specifically, in the present embodiment, the main body 441 of the plate member 440 is extended from the first conduction portion 450 to the end of the electrode body 400 opposite to the positive electrode focusing portion 415. There is.

すなわち、電極体400の正極集束部415を上向きの姿勢で電極体400を容器100に収納した状態において、本体部441が容器100の底に到達する。従って、第一導通部450の高さ方向の位置規制が本体部441によってなされた状態で、第一導通部450と正極端子200との接合作業を行うことができる。つまり、例えば正極端子200を第一導通部450に押し当てた状態で、溶接等の接合の作業を行うことができるため、これにより、例えば接合強度の向上が図られる。その結果、エネルギー密度が高い蓄電素子であって、信頼性が向上された蓄電素子10を得ることができる。   That is, the main body 441 reaches the bottom of the container 100 in a state in which the electrode assembly 400 is accommodated in the container 100 with the positive electrode focusing portion 415 of the electrode assembly 400 facing upward. Therefore, in a state in which the position control in the height direction of the first conduction portion 450 is performed by the main body portion 441, the bonding operation of the first conduction portion 450 and the positive electrode terminal 200 can be performed. That is, for example, in the state where the positive electrode terminal 200 is pressed against the first conduction portion 450, the work of joining such as welding can be performed, thereby improving, for example, the joint strength. As a result, it is a storage element with high energy density, and the storage element 10 with improved reliability can be obtained.

また、上述のように、本体部441において、複数の曲げ部445はX軸方向に並んで配置されているため、複数の曲げ部445が伸ばされるように変形した場合、板状部材440は、主としてX軸方向の幅が長くなる。そのため、本体部441の下端部(Z軸方向マイナス側の端部)が容器100の底に接触した状態であっても、複数の曲げ部445の変形は妨げられない。つまり、板状部材440による、振動または衝撃の吸収機能は発揮される。   Further, as described above, since the plurality of bent portions 445 are arranged side by side in the X-axis direction in the main body portion 441, when the plurality of bent portions 445 are deformed so as to be stretched, the plate member 440 The width in the X-axis direction mainly increases. Therefore, even when the lower end (the end on the negative side in the Z-axis direction) of the main body 441 is in contact with the bottom of the container 100, the deformation of the plurality of bent portions 445 is not prevented. That is, the absorbing function of vibration or impact by the plate member 440 is exhibited.

なお、本実施の形態に係る板状部材440はさらに、負極集束部425に対応する位置に第二導通部460を有している。つまり、本実施の形態では、一枚の板状部材440が、正極用及び負極用の2つの導通部(450、460)を有しているため、正極集束部415及び負極集束部425の両方が比較的に短い場合であっても、それぞれの集束部は対応する導通部に接合することができる。つまり、一つの板状部材440を備えるという簡易な構成によってエネルギー密度が向上された蓄電素子10を得ることができる。   The plate-like member 440 according to the present embodiment further includes a second conductive portion 460 at a position corresponding to the negative electrode converging portion 425. That is, in the present embodiment, since one plate member 440 has the two conducting portions (450, 460) for the positive electrode and the negative electrode, both of the positive electrode focusing portion 415 and the negative electrode focusing portion 425 Is relatively short, each focusing portion can be joined to the corresponding conducting portion. That is, the storage element 10 having an improved energy density can be obtained by a simple configuration including one plate-like member 440.

ここで、本実施の形態に係る蓄電素子10では、上述のように、正極側では第一導通部450と正極端子200とが接合され、かつ、負極側では第二導通部460と負極端子300とが接合される。また、導通部と電極端子との接合の態様は正極側と負極側とで実質的に同一であるため、正極側及び負極側の代表として、正極側の第一導通部450と正極端子200との接合の態様について図6を用いて説明する。   Here, in storage element 10 according to the present embodiment, as described above, first conductive portion 450 and positive electrode terminal 200 are joined on the positive electrode side, and second conductive portion 460 and negative electrode terminal 300 on the negative electrode side. And are joined. In addition, since the mode of bonding between the conductive portion and the electrode terminal is substantially the same on the positive electrode side and the negative electrode side, the first conductive portion 450 on the positive electrode side and the positive electrode terminal 200 are representative of the positive electrode side and the negative electrode side. The mode of bonding of will be described with reference to FIG.

図6は、実施の形態に係る第一導通部450と正極端子200との接合箇所を示す部分断面図である。具体的には、図6は、図2のVI−VI線を通るXZ平面における蓄電素子10の部分断面が示されている。また、板状部材440については断面ではなく側面が図示されており、電極体400の図示は省略されている。   FIG. 6 is a partial cross-sectional view showing a bonding point between the first conductive portion 450 and the positive electrode terminal 200 according to the embodiment. Specifically, FIG. 6 shows a partial cross section of the storage element 10 in the XZ plane passing through the VI-VI line of FIG. Further, the side surface of the plate-like member 440 is illustrated instead of the cross-section, and the illustration of the electrode assembly 400 is omitted.

図6に示すように、正極端子200は、バスバー等が接合される端子本体210と、端子本体210から延設された軸部220とを有している。本実施の形態では、軸部220は、有底筒状に形成されている。図6に示すように、軸部220の先端部が、容器100の内側(下ガスケット510の下方)でかしめられることで、正極端子200が、上ガスケット500及び下ガスケット510とともに蓋板120に固定される。   As shown in FIG. 6, the positive electrode terminal 200 has a terminal main body 210 to which a bus bar or the like is joined, and a shaft portion 220 extended from the terminal main body 210. In the present embodiment, the shaft portion 220 is formed in a bottomed cylindrical shape. As shown in FIG. 6, the positive electrode terminal 200 is fixed to the lid plate 120 together with the upper gasket 500 and the lower gasket 510 by caulking the tip of the shaft portion 220 inside the container 100 (below the lower gasket 510). Be done.

また、かしめられることで平坦な形状となった軸部220の先端部は、第一導通部450の上端面(つまり接続部451)と、例えばレーザ溶接によって接合される。つまり、図6におけるAで示される領域において、正極端子200と第一導通部450とが機械的及び電気的に接続される。   Further, the tip end portion of the shaft portion 220 which is flat by crimping is joined to the upper end surface (that is, the connection portion 451) of the first conduction portion 450 by, for example, laser welding. That is, in the region shown by A in FIG. 6, the positive electrode terminal 200 and the first conduction portion 450 are mechanically and electrically connected.

なお、正極端子200と第一導通部450との接合の手法は溶接には限定されない。例えば、第一導通部450に、接続部451としてのネジ軸を設け、軸部220の先端部を貫通したネジ軸にナットを螺合させることで正極端子200と第一導通部450とを接続してもよい。また、第一導通部450に、接続部451としてのネジ穴を設け、軸部220の先端部を貫通したネジ軸をネジ穴に螺合させることで正極端子200と第一導通部450とを接続してもよい。また、接続部451としてのネジ軸またはネジ穴を第一導通部450に設ける場合、例えば樹脂製のO(オー)リングを用いて、軸部220におけるネジ軸が貫通する箇所の気密を維持してもよい。また、接続部451としてのネジ軸を第一導通部450に設ける場合、ネジ軸は、第一導通部450に一体に設けられていてもよく、第一導通部450に溶接またはかしめ等で取り付けられた別部品であってもよい。   In addition, the method of joining of the positive electrode terminal 200 and the 1st conduction | electrical_connection part 450 is not limited to welding. For example, a screw shaft as the connection portion 451 is provided in the first conductive portion 450, and a nut is screwed to the screw shaft penetrating the tip portion of the shaft portion 220 to connect the positive electrode terminal 200 and the first conductive portion 450. You may In addition, a screw hole as the connection portion 451 is provided in the first conduction portion 450, and a screw shaft penetrating the tip of the shaft portion 220 is screwed into the screw hole, whereby the positive electrode terminal 200 and the first conduction portion 450 are formed. It may be connected. When a screw shaft or a screw hole as the connection portion 451 is provided in the first conduction portion 450, for example, an O (o) ring made of resin is used to maintain airtightness of a portion of the shaft portion 220 where the screw shaft penetrates. May be When the screw shaft as the connection portion 451 is provided in the first conduction portion 450, the screw shaft may be integrally provided in the first conduction portion 450, and is attached to the first conduction portion 450 by welding or caulking or the like. It may be a separate part.

また、詳細な図示及び説明は省略するが、電極体400の負極側も、正極側と同様の態様で負極端子300と電気的に接続される。すなわち、負極集束部425は、第二導通部460に超音波接合等によって接合され、第二導通部460の接続部461は、負極端子300とレーザ溶接等によって接続される。   Moreover, although detailed illustration and description are abbreviate | omitted, the negative electrode side of the electrode body 400 is also electrically connected with the negative electrode terminal 300 in the aspect similar to a positive electrode side. That is, the negative electrode focusing portion 425 is bonded to the second conductive portion 460 by ultrasonic bonding or the like, and the connection portion 461 of the second conductive portion 460 is connected to the negative electrode terminal 300 by laser welding or the like.

以上、実施の形態に係る蓄電素子10について説明したが、蓄電素子10は、図3〜図5に示す態様とは異なる態様の板状部材440を備えてもよい。そこで、以下に、蓄電素子10が備える板状部材440についての変形例を、上記実施の形態との差分を中心に説明する。   As mentioned above, although the electrical storage element 10 which concerns on embodiment was demonstrated, the electrical storage element 10 may be equipped with the plate-shaped member 440 of the aspect different from the aspect shown to FIGS. 3-5. Then, the modification about the plate-shaped member 440 with which the electrical storage element 10 is provided is demonstrated below centering on the difference with the said embodiment.

(変形例1)
図7は、実施の形態の変形例1に係る板状部材440aの構成を示す斜視図である。図7に示すように、本変形例に係る板状部材440aは、X軸方向に並ぶ複数の曲げ部445を有する本体部441と、本体部441の上端部においてX軸方向に離間して配置された第一導通部450及び第二導通部460とを有する。この基本構成において、本変形例に係る板状部材440aは、上記実施の形態に係る板状部材440と共通する。本変形例では、板状部材440aにおいて、第一導通部450と、複数の曲げ部445との間に、切断部446が形成されている点に特徴を有する。なお、本変形例では、第二導通部460と複数の曲げ部445との間にも切断部446が形成されている。また、本変形例では、本体部441のX軸方向の端縁から、本体部441のX軸方向の中心部に向かって伸びるスリットが切断部446として設けられている。
(Modification 1)
FIG. 7 is a perspective view showing a configuration of a plate-like member 440 a according to the first modification of the embodiment. As shown in FIG. 7, the plate-like member 440 a according to the present modification is disposed to be separated in the X-axis direction at the upper end of the main body 441 having a plurality of bent portions 445 aligned in the X-axis direction. And the second conductive portion 460. In this basic configuration, the plate-like member 440 a according to the present modification is in common with the plate-like member 440 according to the above-described embodiment. The present modification is characterized in that a cutting portion 446 is formed between the first conductive portion 450 and the plurality of bent portions 445 in the plate-like member 440 a. In the present modification, the cutting portion 446 is also formed between the second conductive portion 460 and the plurality of bent portions 445. Further, in the present modification, a slit extending from the end edge of the main body 441 in the X-axis direction toward the central portion of the main body 441 in the X-axis direction is provided as the cutting portion 446.

このように、本変形例では、板状部材440aの、複数の曲げ部445が配置された部分と、第一導通部450及び第二導通部460が配置された部分との間に、不連続な部分(切断部446)が存在する。そのため、複数の曲げ部445が配置された部分における伸縮が、第一導通部450及び第二導通部460の位置を移動させるように作用する可能性が低減する。つまり、板状部材440aの、振動または衝撃の吸収等の機能、及び、導通部を支持する機能の双方の実効性が向上する。   As described above, in the present modification, the portion between the plurality of bent portions 445 of the plate member 440a and the portion where the first conductive portion 450 and the second conductive portion 460 are disposed are discontinuous. Portion (cut portion 446) is present. Therefore, the possibility that expansion and contraction in the portion where the plurality of bent portions 445 are disposed acts to move the positions of the first conductive portion 450 and the second conductive portion 460. That is, the effectiveness of both the function such as absorption of vibration or impact of the plate-like member 440a and the function of supporting the conduction portion is improved.

なお、図7に示される切断部446のサイズ、形状、及び位置は一例であり、切断部446は、図7とは異なるサイズ、形状、または位置に形成されてもよい。例えば、Z軸方向の幅が実質的にゼロと認識されるスリットが、切断部446として板状部材440aに設けられてもよい。つまり、X軸方向に伸びる線状の切り込みが、切断部446として板状部材440aに設けられてもよい。この場合、例えば切断部446の形成が容易である。   Note that the size, shape, and position of the cutting portion 446 shown in FIG. 7 are an example, and the cutting portion 446 may be formed in a size, shape, or position different from that of FIG. 7. For example, a slit whose width in the Z-axis direction is recognized as substantially zero may be provided as a cutting portion 446 in the plate-like member 440 a. That is, a linear cut extending in the X-axis direction may be provided as the cutting portion 446 in the plate-like member 440 a. In this case, for example, formation of the cutting portion 446 is easy.

また、切断部446のX軸方向の長さにも特に限定はないが、図7に示すように、例えば正極側において、第一導通部450の直下(Z軸方向マイナス側)の領域を通過する長さに切断部446を配置することで、以下の効果が生じる。すなわち、複数の曲げ部445が変形することで本体部441がX軸方向に伸縮した場合において、その伸縮が、第一導通部450の位置に与える影響がほぼなくなる。このことは、負極側の切断部446についても同じである。   Further, the length of the cutting portion 446 in the X-axis direction is not particularly limited, but as shown in FIG. 7, for example, in the positive electrode side, the region directly below the first conducting portion 450 (Z-axis direction minus side) passes By arranging the cutting portion 446 to a desired length, the following effects occur. That is, when the main body portion 441 expands and contracts in the X-axis direction due to the deformation of the plurality of bent portions 445, the expansion and contraction thereof almost no longer affects the position of the first conductive portion 450. The same applies to the cut portion 446 on the negative electrode side.

また、例えば、本体部441における、第一導通部450の直下(Z軸方向マイナス側)の領域の少なくとも一部に、切断部446が存在しないように、切断部446を配置してもよい。この場合は、第一導通部450の直下に、本体部441の下端部(Z軸方向マイナス側の端部)まで連続する部分が存在する。そのため、例えば、正極端子200と第一導通部450との接合作業の際における、本体部441による第一導通部450の支持の安定化が図られる。このことは、負極側の切断部446についても同じである。   Also, for example, the cutting portion 446 may be disposed so that the cutting portion 446 does not exist in at least a part of the region directly below the first conductive portion 450 (the negative side in the Z-axis direction) in the main body portion 441. In this case, immediately below the first conductive portion 450, there is a portion which continues to the lower end portion (the end portion on the negative side in the Z-axis direction) of the main body portion 441. Therefore, for example, stabilization of the support of the first conduction portion 450 by the main body portion 441 can be achieved at the time of joining work of the positive electrode terminal 200 and the first conduction portion 450. The same applies to the cut portion 446 on the negative electrode side.

(変形例2)
図8は、実施の形態の変形例2に係る板状部材440bの構成を示す斜視図である。図8に示すように、本変形例に係る板状部材440bは、複数の曲げ部445を有する本体部441と、本体部441の上端部においてX軸方向に離間して配置された第一導通部450及び第二導通部460とを有する。この基本構成において、本変形例に係る板状部材440bは、上記実施の形態に係る板状部材440と共通する。本変形例では、板状部材440bにおいて、複数の曲げ部445がZ軸方向に並べられている点に特徴を有する。つまり、複数の曲げ部445は、電極体400における正極集束部415及び負極集束部425の突出方向である第一方向と平行な方向に並べられている。
(Modification 2)
FIG. 8 is a perspective view showing a configuration of a plate-like member 440 b according to the second modification of the embodiment. As shown in FIG. 8, the plate-like member 440 b according to the present modification includes a main portion 441 having a plurality of bent portions 445 and a first conduction arranged at a top end portion of the main portion 441 spaced apart in the X-axis direction. It has a portion 450 and a second conducting portion 460. In this basic configuration, the plate-like member 440b according to the present modification is in common with the plate-like member 440 according to the above-described embodiment. The present modification is characterized in that, in the plate-like member 440b, a plurality of bent portions 445 are arranged in the Z-axis direction. That is, the plurality of bent portions 445 are arranged in a direction parallel to the first direction which is the protruding direction of the positive electrode focusing portion 415 and the negative electrode focusing portion 425 in the electrode body 400.

この場合であっても、板状部材440bは、積層型の電極体400に、積層方向における弾性変形能を付加することができるため、例えば振動または衝撃を吸収する機能、及び、正極板410と負極板420との間隔を狭める機能等が発揮される。また、第一導通部450及び第二導通部460を有することで、上述のように、正極集束部415及び負極集束部425の短縮化等が図られる。   Even in this case, since the plate-like member 440 b can add elastic deformability in the stacking direction to the stacked electrode assembly 400, for example, the plate member 440 b has a function of absorbing vibration or impact; The function of narrowing the distance from the negative electrode plate 420 is exhibited. In addition, by providing the first conductive portion 450 and the second conductive portion 460, the positive electrode focusing portion 415 and the negative electrode focusing portion 425 can be shortened as described above.

なお、本変形例において、板状部材440bの本体部441が板厚方向(Y軸方向)に押圧された場合、本体部441は、Z軸方向に伸びることで、第一導通部450及び第二導通部460を、Z軸方向プラス側(上向き)に押圧する可能性がある。しかし、その押圧力の向きは、第一導通部450及び第二導通部460を、正極端子200及び負極端子300の方向に押さえる向きである。従って、その押圧力が、第一導通部450と正極端子200との接合箇所、及び、第二導通部460と負極端子300との接合箇所に不具合を起こすように作用する可能性は低い。また、複数の曲げ部445が変形することによる本体部441の伸びを阻害しないように、本体部441は、本体部441の下端部が容器100の底に接触しないサイズまたは形状に形成されていることが好ましい。つまり、この場合は、本体部441は、上端部が第一導通部450及び第二導通部460に拘束されていることにより、主としてZ軸方向マイナス側(下向き)に伸びる。   In the present modification, when the main portion 441 of the plate-like member 440 b is pressed in the thickness direction (Y-axis direction), the main portion 441 extends in the Z-axis direction to form the first conductive portion 450 and the There is a possibility that the second conducting portion 460 may be pressed in the Z-axis direction plus side (upward). However, the direction of the pressing force is the direction in which the first conductive portion 450 and the second conductive portion 460 are pressed in the direction of the positive electrode terminal 200 and the negative electrode terminal 300. Therefore, there is a low possibility that the pressing force acts on the joint portion between the first conductive portion 450 and the positive electrode terminal 200 and the joint portion between the second conductive portion 460 and the negative electrode terminal 300. Further, the main body 441 is formed in a size or shape in which the lower end of the main body 441 does not contact the bottom of the container 100 so that the expansion of the main body 441 due to the deformation of the plurality of bent portions 445 is not inhibited. Is preferred. That is, in this case, the main body portion 441 extends mainly in the Z axis direction minus side (downward) by the upper end portion thereof being restrained by the first conduction portion 450 and the second conduction portion 460.

また、複数の曲げ部445の並び方向は、Z軸方向に対して傾いた方向であってもよい。つまり、複数の曲げ部445は、XZ平面内における任意の方向に並べることができ、かつ、どの方向に並べた場合であっても、少なくとも、積層型の電極体400に積層方向における弾性変形能を付加する機能は発揮される。   Further, the direction in which the plurality of bent portions 445 are arranged may be a direction inclined with respect to the Z-axis direction. That is, the plurality of bent portions 445 can be arranged in any direction in the XZ plane, and in any direction, at least at least the elastic deformability in the lamination direction in the laminated electrode body 400 The ability to add

(他の実施の形態)
以上、本発明に係る蓄電素子について、実施の形態及びその変形例に基づいて説明した。しかしながら、本発明は、上記実施の形態及び変形例に限定されるものではない。本発明の趣旨を逸脱しない限り、当業者が思いつく各種変形を上記実施の形態または変形例に施したものも、あるいは、上記説明された複数の構成要素を組み合わせて構築される形態も、本発明の範囲内に含まれる。
(Other embodiments)
In the above, the electrical storage element which concerns on this invention was demonstrated based on embodiment and its modification. However, the present invention is not limited to the above embodiment and modifications. Without departing from the spirit of the present invention, various modifications that can be conceived by those skilled in the art may be applied to the above embodiment or modification, or a form constructed by combining a plurality of components described above will be the present invention. Included in the scope of

例えば、板状部材440が有する曲げ部445の数は1以上であればよい。つまり、板状部材440は、少なくとも1つの曲げ部445を有すれば、電極体400に積層方向の弾性変形能を付加することができる。つまり、耐振動性または耐衝撃性の向上等の効果が得られる。   For example, the number of bent portions 445 included in the plate-like member 440 may be one or more. That is, if the plate-like member 440 has at least one bent portion 445, it is possible to add the elastic deformability in the stacking direction to the electrode body 400. That is, effects such as improvement of vibration resistance or impact resistance can be obtained.

また、曲げ部445の形状は、図4に示される形状には限定されないが、曲げ部445における、正極板410、負極板420またはセパレータ480に接触する部分は、曲面または平面であることが好ましい。これにより、曲げ部445が、直接的に押圧する正極板410、負極板420またはセパレータ480を損傷する可能性が低減される。   Further, the shape of the bending portion 445 is not limited to the shape shown in FIG. 4, but the portion of the bending portion 445 in contact with the positive electrode plate 410, the negative electrode plate 420 or the separator 480 is preferably curved or flat. . As a result, the possibility that the bent portion 445 damages the positive electrode plate 410, the negative electrode plate 420 or the separator 480, which is directly pressed, is reduced.

また、曲げ部445の形状の別例としては、例えばドーム形状が挙げられる。つまり、本体部441からY軸方向に膨出したドーム状の部分が、曲げ部445として機能してもよい。この場合、ドーム状の部分をY軸方向から見た場合の形状としては、円形、長円形、楕円形、多角形など各種の形状を採用し得る。このように、曲げ部445としてドーム状の形状を採用した場合、例えば、1つの曲げ部445が比較的に広い範囲を押圧することができる。これにより、例えば、曲げ部445による押圧力が所定の点または線上に集中することが避けられる。   Moreover, as another example of the shape of the bending part 445, dome shape is mentioned, for example. That is, a dome-shaped portion bulging from the main body 441 in the Y-axis direction may function as the bending portion 445. In this case, various shapes such as a circle, an oval, an ellipse, and a polygon can be adopted as the shape when the dome-like portion is viewed from the Y-axis direction. Thus, when the dome-like shape is adopted as the bending portion 445, for example, one bending portion 445 can press a relatively wide range. Thereby, for example, concentration of pressure by the bending portion 445 on a predetermined point or line is avoided.

また、図4では、曲げ部445は連続して並べられているが、隣り合う2つの曲げ部445の間に、フラットな領域(XZ平面に平行な領域)が存在してもよい。例えば、本体部441において、XZ平面内の所定の部分のみに1以上の曲げ部445を配置し、他の部分はフラットな領域としてもよい。これにより、Y軸方向から見た場合における電極体400の一部の領域であって、当該所定の部分に対応する領域を、主として押圧された状態に置くことができる。   Further, in FIG. 4, the bent portions 445 are continuously arranged, but a flat region (region parallel to the XZ plane) may be present between two adjacent bent portions 445. For example, in the main body portion 441, one or more bent portions 445 may be disposed only in a predetermined portion in the XZ plane, and the other portion may be a flat region. Thereby, it is possible to place the region corresponding to the predetermined portion, which is a partial region of the electrode body 400 when viewed from the Y-axis direction, mainly in a pressed state.

また、例えば図5において、板状部材440は、セパレータ480に挟まれているが、板状部材440の本体部441が樹脂等の絶縁材料により形成されている場合、板状部材440の側面にセパレータ480が配置されていなくてもよい。つまり、板状部材440の両側に、セパレータ480を介在させずに、正極板410または負極板420が配置されていてもよい。   Further, for example, in FIG. 5, the plate-like member 440 is sandwiched by the separator 480, but when the main body 441 of the plate-like member 440 is formed of an insulating material such as resin, The separator 480 may not be disposed. That is, the positive electrode plate 410 or the negative electrode plate 420 may be disposed on both sides of the plate member 440 without interposing the separator 480.

また、板状部材440は、PP、PE、またはPPS等の樹脂で形成された本体部441に、金属製の第一導通部450及び第二導通部460が取り付けられるとしたが、板状部材440の構成はこれに限定されない。例えば、金属板の一部を残し、他の部分の表面を樹脂でコーティングすることで、樹脂がコーティングされた部分である本体部と、金属板が露出した部分である第一導通部とを有する板状部材が構成されてもよい。なお、この場合、本体部に第二導通部としての金属部材を取り付けることで、金属板を基材とする板状部材であって、実質的に板状部材440と同一の機能を備える板状部材を得ることができる。なお、板状部材440の基材として金属が採用された場合であっても、例えば、電極体400に押圧力が働いた場合に、正極板410、負極板420、及びセパレータ480を損傷させることなく曲げ部445を弾性変形させることは可能である。また、インサート成形によって、金属製の第一導通部450及び第二導通部460と、樹脂製の本体部441とを有する板状部材440が作製されてもよい。   In the plate member 440, the first conductive portion 450 and the second conductive portion 460 made of metal are attached to the main body portion 441 formed of resin such as PP, PE, or PPS. The configuration of 440 is not limited to this. For example, by leaving a part of the metal plate and coating the surface of the other part with a resin, it has a main body part which is a part coated with a resin, and a first conducting part which is a part where the metal plate is exposed. A plate-like member may be configured. In this case, by attaching a metal member as the second conductive portion to the main body portion, it is a plate-like member using a metal plate as a base material, and having a plate shape substantially having the same function as the plate-like member 440. A member can be obtained. Even when metal is adopted as the base material of the plate-like member 440, for example, when a pressing force is applied to the electrode body 400, the positive electrode plate 410, the negative electrode plate 420, and the separator 480 are damaged. It is possible to elastically deform the bending portion 445. Alternatively, the plate-like member 440 having the first and second conductive portions 450 and 460 and the main body 441 made of resin may be manufactured by insert molding.

また、導通部を備える板状部材は、正極用と負極用とで別々に配置されていてもよい。例えば、本体部441(図3参照)に第一導通部450のみを取り付けることで正極用の板状部材を構成し、別の本体部441に第二導通部460のみを取り付けることで負極用の板状部材を構成してもよい。この場合、電極体400に、積層方向の厚みを変化させるように弾性変形する板状部材が、積層列に2つ含まれることになる。そのため、例えば、積層型の電極体400における積層方向の弾性変形能が向上する。その結果、例えば電極体400の耐振動性または耐衝撃性が向上する。また、例えば、第一導通部450及び第二導通部460の位置が、積層方向においてずらされる。そのため、例えば、正極端子200及び負極端子300の構造、サイズ、及び容器100における位置等に応じて、第一導通部450及び第二導通部460のそれぞれを適切な位置に配置することができる。   Moreover, the plate-shaped member provided with the conduction part may be separately disposed for the positive electrode and the negative electrode. For example, by attaching only the first conducting part 450 to the main body part 441 (see FIG. 3), a plate member for the positive electrode is configured, and by attaching only the second conducting part 460 to another main body part 441 You may comprise a plate-shaped member. In this case, the electrode assembly 400 includes two plate-like members which are elastically deformed so as to change the thickness in the stacking direction. Therefore, for example, the elastic deformability in the stacking direction in the stacked electrode body 400 is improved. As a result, for example, vibration resistance or impact resistance of the electrode body 400 is improved. Also, for example, the positions of the first conducting portion 450 and the second conducting portion 460 are shifted in the stacking direction. Therefore, each of the first conductive portion 450 and the second conductive portion 460 can be disposed at an appropriate position depending on, for example, the structure, the size, and the position in the container 100 of the positive electrode terminal 200 and the negative electrode terminal 300.

また、第一導通部450と正極端子200とは直接的に接続される必要はない。例えば、第一導通部450と正極端子200との間に、例えば集電体と呼ばれる金属部材が介在してもよい。このことは、負極側の第二導通部460についても同じである。   In addition, the first conduction portion 450 and the positive electrode terminal 200 do not have to be directly connected. For example, a metal member called a current collector may be interposed between the first conducting portion 450 and the positive electrode terminal 200, for example. The same applies to the second conducting portion 460 on the negative electrode side.

また、板状部材440は、第一導通部450及び第二導通部460を備えなくてもよい。つまり、板状部材440は、1以上の曲げ部445を有することで、電極体400に、積層方向における弾性変形能を付加することができる。これにより、上述のように、電極体400の耐振動性もしくは耐衝撃性の向上、極板の間隔が狭められることによる発電効率の向上、または、容器100内の電極体400の体積割合の増加によるエネルギー密度の向上等の効果をもたらすことができる。   Further, the plate-like member 440 may not include the first conducting part 450 and the second conducting part 460. That is, the plate-like member 440 can add an elastic deformability in the stacking direction to the electrode body 400 by having the one or more bent portions 445. Thereby, as described above, the vibration resistance or impact resistance of the electrode assembly 400 is improved, the power generation efficiency is improved by narrowing the distance between the electrode plates, or the volume ratio of the electrode assembly 400 in the container 100 is increased. Effects such as improvement of energy density can be brought about.

また、板状部材440は、例えば、長尺帯状の極板を山折りと谷折りとの繰り返しによって蛇腹状に積層した構造を有する電極体に対して配置されてもよい。この場合であっても、電極体は、正極板、負極板及びセパレータが積層された積層列を有しており、かつ、積層列の、積層方向と直交する方向の端部には集束部が形成されている。従って、この積層列のいずれかの位置に板状部材440を配置することで、耐振動性または耐衝撃性の向上等の効果を得ることは可能である。   Further, the plate-like member 440 may be disposed, for example, with respect to the electrode body having a structure in which long strip-like electrode plates are stacked in a bellows shape by repeating mountain folds and valley folds. Even in this case, the electrode body has a laminated row in which the positive electrode plate, the negative electrode plate, and the separator are laminated, and a converging portion is provided at the end of the laminated array in the direction orthogonal to the laminating direction. It is formed. Therefore, by disposing the plate-like member 440 at any position of this laminated row, it is possible to obtain effects such as improvement of vibration resistance or impact resistance.

なお、上記の板状部材440に関する各種の補足事項は、変形例1に係る板状部材440a及び変形例2に係る板状部材440bのそれぞれにも適用される。また、上記実施の形態及び上記変形例を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。   In addition, the various supplementary matters regarding said plate-shaped member 440 are applied also to each of the plate-shaped member 440a which concerns on the modification 1, and the plate-shaped member 440b which concerns on the modification 2. FIG. Further, a form constructed by arbitrarily combining the above embodiment and the above modification is also included in the scope of the present invention.

本発明は、リチウムイオン二次電池などの蓄電素子等に適用できる。   The present invention is applicable to storage devices such as lithium ion secondary batteries.

10 蓄電素子
100 容器
110 容器本体
120 蓋板
200 正極端子
210 端子本体
220 軸部
300 負極端子
400 電極体
401 電極体本体
410 正極板
411 正極タブ
415 正極集束部
420 負極板
421 負極タブ
425 負極集束部
440、440a、440b 板状部材
441 本体部
445 曲げ部
446 切断部
450 第一導通部
451、461 接続部
460 第二導通部
480 セパレータ
500、600 上ガスケット
510 下ガスケット
DESCRIPTION OF SYMBOLS 10 electricity storage element 100 container 110 container main body 120 lid plate 200 positive electrode terminal 210 terminal main body 220 axial part 300 negative electrode terminal 400 electrode body 401 electrode body main body 410 positive electrode plate 411 positive electrode tab 415 positive electrode focusing portion 420 negative electrode plate 421 negative electrode tab 425 negative electrode focusing portion 440, 440a, 440b Plate-like member 441 Body part 445 Bent part 446 Cutting part 450 First conducting part 451, 461 Connecting part 460 Second conducting part 480 Separator 500, 600 Upper gasket 510 Lower gasket

Claims (5)

極板及びセパレータが積層された積層列を有する電極体を備える蓄電素子であって、
前記積層列の積層方向における両端以外のいずれかの位置には、さらに、前記極板及び前記セパレータとは異なる板状部材が配置されており、
前記板状部材は、板厚方向に曲がった曲げ部を有する
蓄電素子。
What is claimed is: 1. A storage element comprising:
A plate-like member different from the electrode plate and the separator is further disposed at any position other than both ends in the stacking direction of the stacked row,
The plate-like member has a bent portion bent in a plate thickness direction.
前記曲げ部は、前記板状部材において、前記板厚方向と直交する方向に複数並んで配置されている
請求項1記載の蓄電素子。
The storage element according to claim 1, wherein a plurality of the bending portions are arranged in the direction perpendicular to the plate thickness direction in the plate-like member.
前記電極体は、電極体本体と、前記電極体本体から第一方向に突出して設けられた、前記極板の端部が積層されることで形成された集束部とを有し、
複数の前記曲げ部は、前記板状部材の、前記電極体本体に対応する部分において、前記第一方向と直交する第二方向に並んで配置されている
請求項2記載の蓄電素子。
The electrode body has an electrode body main body, and a focusing portion formed by laminating the end portions of the electrode plates, which are provided so as to protrude from the electrode body main body in a first direction,
The storage element according to claim 2, wherein the plurality of bent portions are arranged in a second direction orthogonal to the first direction in a portion of the plate-like member corresponding to the electrode body.
前記板状部材は、前記集束部に対応する位置に導通部を有する
請求項3記載の蓄電素子。
The storage element according to claim 3, wherein the plate-like member has a conductive portion at a position corresponding to the focusing portion.
前記板状部材において、前記導通部と、前記複数の前記曲げ部との間に、切断部が形成されている
請求項4記載の蓄電素子。
The storage element according to claim 4, wherein in the plate-like member, a cutting portion is formed between the conductive portion and the plurality of bent portions.
JP2017190452A 2017-09-29 2017-09-29 Power storage element Active JP7020034B2 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05174864A (en) * 1991-12-24 1993-07-13 Japan Storage Battery Co Ltd Hermetic type lead-acid battery
JP2001210293A (en) * 2000-01-28 2001-08-03 Yuasa Corp Assembled battery
JP2008311173A (en) * 2007-06-18 2008-12-25 Toyota Motor Corp Electric storage device
WO2012111752A1 (en) * 2011-02-18 2012-08-23 新神戸電機株式会社 Secondary battery
JP2013041741A (en) * 2011-08-15 2013-02-28 Toyota Industries Corp Secondary battery
JP2016004633A (en) * 2014-06-13 2016-01-12 株式会社Gsユアサ Power storage element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05174864A (en) * 1991-12-24 1993-07-13 Japan Storage Battery Co Ltd Hermetic type lead-acid battery
JP2001210293A (en) * 2000-01-28 2001-08-03 Yuasa Corp Assembled battery
JP2008311173A (en) * 2007-06-18 2008-12-25 Toyota Motor Corp Electric storage device
WO2012111752A1 (en) * 2011-02-18 2012-08-23 新神戸電機株式会社 Secondary battery
JP2013041741A (en) * 2011-08-15 2013-02-28 Toyota Industries Corp Secondary battery
JP2016004633A (en) * 2014-06-13 2016-01-12 株式会社Gsユアサ Power storage element

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