JP2016018658A - Power storage element - Google Patents

Power storage element Download PDF

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JP2016018658A
JP2016018658A JP2014140415A JP2014140415A JP2016018658A JP 2016018658 A JP2016018658 A JP 2016018658A JP 2014140415 A JP2014140415 A JP 2014140415A JP 2014140415 A JP2014140415 A JP 2014140415A JP 2016018658 A JP2016018658 A JP 2016018658A
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electrode
electrode body
positive electrode
conductive member
container
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JP6413406B2 (en
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瞬 伊藤
Shun Ito
瞬 伊藤
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GS Yuasa 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

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Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of suppressing a large current from flowing in a case even when a positive electrode and a negative electrode of an electrode body are short-circuited via the case.SOLUTION: A power storage element 10 includes: an electrode body 140 including a positive electrode and a negative electrode; and a case 100 housing the electrode body 140. The power storage element also includes a conducting member 410 that is a member arranged between the electrode body 140 and the case 100 and contains an insulating material. The positive electrode or the negative electrode of the electrode body 140 is electrically connected with the case 100 via the conducting member 410.SELECTED DRAWING: Figure 5

Description

本発明は、正極及び負極を有する電極体と、当該電極体が収容される容器とを備える蓄電素子に関する。   The present invention relates to a power storage device including an electrode body having a positive electrode and a negative electrode, and a container in which the electrode body is accommodated.

世界的な環境問題への取り組みとして、ガソリン自動車から電気自動車への転換が重要になってきている。このため、リチウムイオン二次電池などの蓄電素子を動力源に用いた電気自動車の開発が進められている。そして、このような蓄電素子においては、一般的に、正極及び負極を有する電極体と、当該電極体が収容される容器とを備えている。   The shift from gasoline cars to electric cars has become important as a global environmental problem. For this reason, development of an electric vehicle using a power storage element such as a lithium ion secondary battery as a power source is being promoted. And in such an electrical storage element, generally, the electrode body which has a positive electrode and a negative electrode, and the container in which the said electrode body is accommodated are provided.

ここで、従来、当該蓄電素子において、容器の腐食を防ぐなどの理由から、容器を電極体の正極に電気的に接続し、当該容器を正極電位とする蓄電素子が提案されている（例えば、特許文献１参照）。   Here, conventionally, for the reason such as preventing corrosion of the container in the power storage element, a power storage element in which the container is electrically connected to the positive electrode of the electrode body and the container is set to a positive electrode potential has been proposed (for example, Patent Document 1).

特開平９−１３４７０９号公報JP-A-9-134709

しかしながら、上記従来の蓄電素子では、容器と電極体の正極とが導通しているため、当該容器が電極体の負極と短絡してしまった場合には、当該容器に大電流が流れてしまうという問題がある。つまり、電極体の正極と負極とが容器を介して短絡した場合には、当該容器に大電流が流れてしまう。   However, in the conventional power storage device, since the container and the positive electrode of the electrode body are electrically connected, if the container is short-circuited with the negative electrode of the electrode body, a large current flows through the container. There's a problem. That is, when the positive electrode and the negative electrode of the electrode body are short-circuited via the container, a large current flows through the container.

本発明は、上記問題を解決するためになされたものであり、電極体の正極と負極とが容器を介して短絡した場合でも、当該容器に大電流が流れるのを抑制することができる蓄電素子を提供することを目的とする。   The present invention has been made to solve the above problem, and even when the positive electrode and the negative electrode of the electrode body are short-circuited through the container, the electric storage element capable of suppressing a large current from flowing through the container The purpose is to provide.

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、正極及び負極を有する電極体と、前記電極体が収容される容器とを備える蓄電素子であって、前記電極体と前記容器との間に配置される部材であって、絶縁性材料を含有した導電性部材を備え、前記電極体の前記正極または前記負極と前記容器とは、前記導電性部材を介して電気的に接続される。   In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including an electrode body having a positive electrode and a negative electrode, and a container in which the electrode body is housed. A member disposed between the container and a conductive member containing an insulating material, wherein the positive electrode or the negative electrode of the electrode body and the container are electrically connected via the conductive member. Connected.

これによれば、蓄電素子において、電極体と容器とは、当該電極体と容器との間に配置された絶縁性材料を含有した導電性部材を介して、電気的に接続されている。ここで、当該導電性部材は、絶縁性材料を基材とした導電性を有する部材であるため、高抵抗の導電性部材である。このため、電極体の正極と負極とが容器を介して短絡した場合でも、電極体と容器とは高抵抗の導電性部材を介して電気的に接続されていることから、電極体から容器へ大電流が流れるのを抑制することができる。   According to this, in the power storage element, the electrode body and the container are electrically connected via the conductive member containing the insulating material disposed between the electrode body and the container. Here, since the conductive member is a member having conductivity based on an insulating material, the conductive member is a high-resistance conductive member. For this reason, even when the positive electrode and the negative electrode of the electrode body are short-circuited via the container, the electrode body and the container are electrically connected via the high-resistance conductive member, and therefore, from the electrode body to the container. A large current can be suppressed from flowing.

また、前記導電性部材は、導電性の部材が所定の割合で混合された樹脂から形成されていることにしてもよい。   The conductive member may be formed of a resin in which conductive members are mixed at a predetermined ratio.

これによれば、当該導電性部材は、導電性の部材が所定の割合で混合された樹脂から形成されているため、導電性の部材を所定の割合で樹脂に混合することで、簡易に、当該導電性部材を形成することができる。   According to this, since the conductive member is formed of a resin in which the conductive member is mixed at a predetermined ratio, by simply mixing the conductive member with the resin at a predetermined ratio, The conductive member can be formed.

また、前記導電性部材は、前記電極体と前記容器の長側面との間に配置される導電性フィルムであることにしてもよい。   Further, the conductive member may be a conductive film disposed between the electrode body and the long side surface of the container.

ここで、電極体と容器の短側面との間は、スペースが広く空いている場合が多く、そこに当該導電性部材を配置する場合には、当該導電性部材の厚さを厚くする必要があるため、当該導電性部材の重量アップやコストアップにつながる。これに対し、電極体は、容器の長側面に当接するように配置されるため、当該導電性部材を電極体と容器の長側面との間に配置することで、当該導電性部材として厚みの薄い導電性フィルムを用いることができる。   Here, there is often a large space between the electrode body and the short side surface of the container, and when the conductive member is disposed there, it is necessary to increase the thickness of the conductive member. Therefore, it leads to an increase in weight and cost of the conductive member. On the other hand, since the electrode body is disposed so as to contact the long side surface of the container, the conductive member is disposed between the electrode body and the long side surface of the container so that the thickness of the conductive member can be increased. A thin conductive film can be used.

また、前記導電性部材は、前記電極体の正極と前記容器とを電気的に接続しており、前記電極体の正極に電気的に接続される正極集電体との距離の方が、前記電極体の負極に電気的に接続される負極集電体との距離よりも近くなるように配置されていることにしてもよい。   The conductive member electrically connects the positive electrode of the electrode body and the container, and the distance from the positive electrode current collector electrically connected to the positive electrode of the electrode body is greater than You may decide to arrange | position so that it may become closer than the distance with the negative electrode electrical power collector electrically connected to the negative electrode of an electrode body.

これによれば、当該導電性部材は、電極体の正極と電気的に接続されており、正極集電体との距離の方が負極集電体との距離よりも近くなるように配置されている。つまり、当該導電性部材は、電極体の正極と導通しているため、電極体の負極と導通しないように、負極側から離して配置されている。これにより、電極体の正極と負極とが当該導電性部材を介して短絡するのを抑制することができる。   According to this, the conductive member is electrically connected to the positive electrode of the electrode body, and is disposed so that the distance from the positive electrode current collector is closer than the distance from the negative electrode current collector. Yes. That is, since the conductive member is electrically connected to the positive electrode of the electrode body, the conductive member is disposed away from the negative electrode side so as not to be electrically connected to the negative electrode of the electrode body. Thereby, it can suppress that the positive electrode and negative electrode of an electrode body short-circuit via the said electroconductive member.

また、さらに、前記導電性部材と前記電極体との間に配置される金属箔を備え、前記導電性部材と前記電極体とは、前記金属箔を介して電気的に接続されることにしてもよい。   Furthermore, it is further provided with a metal foil disposed between the conductive member and the electrode body, and the conductive member and the electrode body are electrically connected via the metal foil. Also good.

これによれば、当該導電性部材と電極体との間に金属箔を配置することで、容易に、電極体と当該導電性部材とを電気的に接続することができる。   According to this, an electrode body and the said electroconductive member can be electrically connected easily by arrange | positioning metal foil between the said electroconductive member and an electrode body.

また、前記金属箔は、前記電極体の正極に電気的に接続される正極集電体と前記電極体との間に配置されるとともに、前記電極体の最外周のセパレータと前記導電性部材との間に配置されていることにしてもよい。   The metal foil is disposed between a positive electrode current collector electrically connected to a positive electrode of the electrode body and the electrode body, and an outermost separator of the electrode body and the conductive member. You may decide to arrange | position between.

これによれば、正極集電体と電極体との間、かつ電極体の最外周のセパレータと当該導電性部材との間に金属箔を配置することで、容易に、電極体の正極と当該導電性部材とを電気的に接続することができる。   According to this, by arranging the metal foil between the positive electrode current collector and the electrode body and between the outermost separator of the electrode body and the conductive member, the positive electrode of the electrode body and the The conductive member can be electrically connected.

また、前記導電性部材は、前記電極体の正極に電気的に接続される正極集電体と前記容器との間に配置されるスペーサであることにしてもよい。   The conductive member may be a spacer disposed between a positive electrode current collector electrically connected to a positive electrode of the electrode body and the container.

これによれば、当該導電性部材は、正極集電体と容器との間に配置されるスペーサであるため、正極集電体を介して電極体の正極と容器とを電気的に接続することで、容易に、電極体の正極と容器とを電気的に接続することができる。   According to this, since the conductive member is a spacer disposed between the positive electrode current collector and the container, the positive electrode of the electrode body and the container are electrically connected via the positive electrode current collector. Thus, the positive electrode of the electrode body and the container can be easily electrically connected.

なお、本発明は、このような蓄電素子として実現することができるだけでなく、蓄電素子が備える当該導電性部材としても実現することができる。   Note that the present invention can be realized not only as such a power storage element but also as the conductive member included in the power storage element.

本発明における蓄電素子によれば、電極体の正極と負極とが容器を介して短絡した場合でも、当該容器に大電流が流れるのを抑制することができる。   According to the electricity storage device of the present invention, even when the positive electrode and the negative electrode of the electrode body are short-circuited via the container, it is possible to suppress a large current from flowing through the container.

本発明の実施の形態に係る蓄電素子の外観を模式的に示す斜視図である。It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment of this invention. 本発明の実施の形態に係る蓄電素子を分解した場合の各構成要素を示す分解斜視図である。It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage element which concerns on embodiment of this invention. 本発明の実施の形態に係る電極体から導電性部材と金属箔とを分離させた場合の外観を示す斜視図である。It is a perspective view which shows the external appearance at the time of isolate | separating a conductive member and metal foil from the electrode body which concerns on embodiment of this invention. 本発明の実施の形態に係る蓄電素子を側方から見た場合の内部構成を示す平面図である。It is a top view which shows an internal structure at the time of seeing the electrical storage element which concerns on embodiment of this invention from the side. 本発明の実施の形態に係る導電性部材及び金属箔の正極側の構成及び配置を示す断面図である。It is sectional drawing which shows the structure and arrangement | positioning by the side of the positive electrode of the electroconductive member and metal foil which concern on embodiment of this invention. 本発明の実施の形態に係る導電性部材及び金属箔の負極側の構成及び配置を示す断面図である。It is sectional drawing which shows the structure and arrangement | positioning by the side of the negative electrode of the electroconductive member and metal foil which concern on embodiment of this invention. 本発明の実施の形態の変形例１に係る蓄電素子の構成を示す平面図である。It is a top view which shows the structure of the electrical storage element which concerns on the modification 1 of embodiment of this invention. 本発明の実施の形態の変形例２に係る蓄電素子の構成を示す断面図である。It is sectional drawing which shows the structure of the electrical storage element which concerns on the modification 2 of embodiment of this invention. 本発明の実施の形態の変形例２の他の例に係る電極体の構成を示す斜視図である。It is a perspective view which shows the structure of the electrode body which concerns on the other example of the modification 2 of embodiment of this invention. 本発明の実施の形態の変形例３に係る蓄電素子の構成を示す断面図である。It is sectional drawing which shows the structure of the electrical storage element which concerns on the modification 3 of embodiment of this invention.

以下、図面を参照しながら、本発明の実施の形態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は、いずれも本発明の好ましい一具体例を示すものである。以下の実施の形態で示される数値、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。   Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

（実施の形態）
まず、蓄電素子１０の構成について、説明する。 (Embodiment)
First, the configuration of the power storage element 10 will be described.

図１は、本発明の実施の形態に係る蓄電素子１０の外観を模式的に示す斜視図である。また、図２は、本発明の実施の形態に係る蓄電素子１０を分解した場合の各構成要素を示す分解斜視図である。また、図３は、本発明の実施の形態に係る電極体１４０から導電性部材４１０と金属箔４２０とを分離させた場合の外観を示す斜視図である。   FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing each component when the power storage device 10 according to the embodiment of the present invention is disassembled. FIG. 3 is a perspective view showing an appearance when the conductive member 410 and the metal foil 420 are separated from the electrode body 140 according to the embodiment of the present invention.

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、より具体的には、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。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。   The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

これらの図に示すように、蓄電素子１０は、容器１００と、正極端子２００と、負極端子３００とを備えている。また、容器１００の内方には、正極集電体１２０と、負極集電体１３０と、電極体１４０と、導電性部材４１０と、金属箔４２０と、スペーサ５１０及び５２０とが収容されている。   As shown in these drawings, the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300. Further, inside the container 100, a positive electrode current collector 120, a negative electrode current collector 130, an electrode body 140, a conductive member 410, a metal foil 420, and spacers 510 and 520 are accommodated. .

また、蓄電素子１０の容器１００の内部には電解液（非水電解液）などの液体が封入されているが、当該液体の図示は省略する。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。   In addition, a liquid such as an electrolytic solution (non-aqueous electrolytic solution) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. In addition, as long as it does not impair the performance of the electrical storage element 10, as the electrolyte solution enclosed with the container 100, there is no restriction | limiting in particular and various things can be selected.

容器１００は、矩形筒状で底を備える本体１１１と、本体１１１の開口を閉塞する板状部材である蓋体１１０とで構成されている。また、容器１００は、電極体１４０、導電性部材４１０、金属箔４２０、スペーサ５１０及び５２０等を内部に収容後、蓋体１１０と本体１１１とが溶接等されることにより、内部を密封することができるものとなっている。なお、蓋体１１０及び本体１１１の材質は、特に限定されないが、例えば、アルミニウム、アルミニウム合金など溶接可能な金属であるのが好ましい。   The container 100 includes a main body 111 having a rectangular cylindrical shape and a bottom, and a lid 110 that is a plate-like member that closes an opening of the main body 111. In addition, the container 100 seals the interior by accommodating the electrode body 140, the conductive member 410, the metal foil 420, the spacers 510 and 520, and the like, and then the lid body 110 and the main body 111 are welded. It is possible to do. The material of the lid 110 and the main body 111 is not particularly limited, but is preferably a weldable metal such as aluminum or aluminum alloy.

電極体１４０は、正極と負極とセパレータとを備え、電気を蓄えることができる発電要素である。具体的には、電極体１４０は、正極と負極との間にセパレータが挟み込まれるように層状に配置されたものを全体が長円形状となるように巻回されて形成された巻回型の電極体である。なお、電極体１４０の形状は円形状または楕円形状でもよい。また、電極体１４０の形状は捲回型に限らず、平板状極板を積層した形状でもよい。   The electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a power generation element that can store electricity. Specifically, the electrode body 140 is a winding type formed by winding a layered arrangement so that a separator is sandwiched between a positive electrode and a negative electrode so that the whole becomes an oval shape. It is an electrode body. The shape of the electrode body 140 may be circular or elliptical. The shape of the electrode body 140 is not limited to a wound type, and may be a shape in which flat plate plates are laminated.

正極は、アルミニウムまたはアルミニウム合金などからなる長尺帯状の導電性の金属箔である正極基材層の表面に、正極活物質層が形成された電極板である。なお、正極活物質層に用いられる正極活物質としては、リチウムイオンを吸蔵放出可能な正極活物質であれば、適宜公知の材料を使用できる。例えば、正極活物質として、ＬｉＭＰＯ４、ＬｉＭＳｉＯ４、ＬｉＭＢＯ３（ＭはＦｅ、Ｎｉ、Ｍｎ、Ｃｏ等から選択される１種又は２種以上の遷移金属元素）等のポリアニオン化合物、チタン酸リチウム、マンガン酸リチウム等のスピネル化合物、ＬｉＭＯ２（ＭはＦｅ、Ｎｉ、Ｍｎ、Ｃｏ等から選択される１種又は２種以上の遷移金属元素）等のリチウム遷移金属酸化物等を用いることができる。 The positive electrode is an electrode plate in which a positive electrode active material layer is formed on the surface of a positive electrode base material layer which is a long strip-like conductive metal foil made of aluminum or an aluminum alloy. In addition, as a positive electrode active material used for a positive electrode active material layer, if it is a positive electrode active material which can occlude / release lithium ion, a well-known material can be used suitably. For example, as a positive electrode active material, a polyanion compound such as LiMPO 4 , LiMSiO 4 , LiMBO 3 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), lithium titanate, Spinel compounds such as lithium manganate, lithium transition metal oxides such as LiMO 2 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, and the like) can be used.

負極は、銅または銅合金などからなる長尺帯状の導電性の金属箔である負極基材層の表面に、負極活物質層が形成された電極板である。なお、負極活物質層に用いられる負極活物質としては、リチウムイオンを吸蔵放出可能な負極活物質であれば、適宜公知の材料を使用できる。例えば、負極活物質として、リチウム金属、リチウム合金（リチウム−アルミニウム、リチウム−鉛、リチウム−錫、リチウム−アルミニウム−錫、リチウム−ガリウム、及びウッド合金等のリチウム金属含有合金）の他、リチウムを吸蔵・放出可能な合金、炭素材料（例えば黒鉛、難黒鉛化炭素、易黒鉛化炭素、低温焼成炭素、非晶質カーボン等）、金属酸化物、リチウム金属酸化物（Ｌｉ４Ｔｉ５Ｏ１２等）、ポリリン酸化合物などが挙げられる。 The negative electrode is an electrode plate in which a negative electrode active material layer is formed on the surface of a negative electrode base material layer which is a long strip-like conductive metal foil made of copper or a copper alloy. In addition, as a negative electrode active material used for a negative electrode active material layer, if it is a negative electrode active material which can occlude-release lithium ion, a well-known material can be used suitably. For example, as the negative electrode active material, lithium metal, lithium alloy (lithium metal-containing alloys such as lithium-aluminum, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy), and lithium can be used. Alloys that can be occluded and released, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), metal oxides, lithium metal oxides (Li 4 Ti 5 O 12 etc. ) And polyphosphoric acid compounds.

ここで、電極体１４０は、正極と負極とが、セパレータを介して、巻回軸（本実施の形態ではＸ軸方向に平行な仮想軸）の方向に互いにずらして巻回されている。そして、正極及び負極は、それぞれのずらされた方向の端縁部に、活物質層が形成されていない部分（活物質層非形成部）を有している。   Here, in the electrode body 140, the positive electrode and the negative electrode are wound with a shift in the direction of the winding axis (in this embodiment, a virtual axis parallel to the X-axis direction) via a separator. And the positive electrode and the negative electrode have the part (active material layer non-formation part) in which the active material layer is not formed in the edge part of each shifted direction.

具体的には、図２及び図３に示すように、電極体１４０は、巻回軸方向の一端（Ｘ軸マイナス方向の端部）に、正極の活物質層非形成部が積層された正極側端部１４０ａを有し、巻回軸方向の他端（Ｘ軸プラス方向の端部）に、負極の活物質層非形成部が積層された負極側端部１４０ｂを有している。つまり、電極体１４０は、正極側の端部に正極側端部１４０ａを有し、負極側の端部に負極側端部１４０ｂを有している。   Specifically, as shown in FIGS. 2 and 3, the electrode body 140 includes a positive electrode in which a positive electrode active material layer non-forming portion is stacked at one end in the winding axis direction (end in the X-axis minus direction). It has a side end portion 140a, and has a negative electrode side end portion 140b in which a negative electrode active material layer non-forming portion is laminated at the other end in the winding axis direction (end portion in the X-axis plus direction). That is, the electrode body 140 has a positive electrode side end portion 140a at the positive electrode side end portion and a negative electrode side end portion 140b at the negative electrode side end portion.

そして、電極体１４０は、正極側端部１４０ａが正極集電体１２０に接合され、負極側端部１４０ｂが負極集電体１３０に接合されることで、正極集電体１２０及び負極集電体１３０に接合される。   The electrode body 140 has the positive electrode side end portion 140a joined to the positive electrode current collector 120 and the negative electrode side end portion 140b joined to the negative electrode current collector 130, whereby the positive electrode current collector 120 and the negative electrode current collector are joined. 130.

また、電極体１４０の周囲には、導電性部材４１０及び金属箔４２０が巻きつけられている。   A conductive member 410 and a metal foil 420 are wound around the electrode body 140.

ここで、導電性部材４１０及び金属箔４２０は、長方形状のシート状の部材であり、電極体１４０に巻き付けられて配置されている。つまり、まず金属箔４２０が電極体１４０に巻き付けられ、電極体１４０に巻き付けられた金属箔４２０上に導電性部材４１０が巻き付けられて配置されている。導電性部材４１０及び金属箔４２０の詳細な説明については、後述する。   Here, the conductive member 410 and the metal foil 420 are rectangular sheet-like members and are wound around the electrode body 140 and arranged. That is, first, the metal foil 420 is wound around the electrode body 140, and the conductive member 410 is wound around the metal foil 420 wound around the electrode body 140. Detailed description of the conductive member 410 and the metal foil 420 will be described later.

正極端子２００は、正極集電体１２０を介して、電極体１４０の正極に電気的に接続された電極端子であり、負極端子３００は、負極集電体１３０を介して、電極体１４０の負極に電気的に接続された電極端子である。   The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the electrode body 140 via the positive electrode current collector 120, and the negative electrode terminal 300 is the negative electrode of the electrode body 140 via the negative electrode current collector 130. The electrode terminal is electrically connected to.

つまり、正極端子２００及び負極端子３００は、電極体１４０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１４０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電極端子である。また、正極端子２００及び負極端子３００は、電極体１４０の上方に配置された蓋体１１０に取り付けられている。   In other words, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode body 140 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 140, It is an electrode terminal made of metal for introducing. The positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid body 110 disposed above the electrode body 140.

具体的には、正極端子２００は、リベットが蓋体１１０の貫通孔と正極集電体１２０の貫通孔とに挿入されて、かしめられることにより、正極集電体１２０とともに蓋体１１０に固定される。また、負極端子３００は、リベットが蓋体１１０の貫通孔と負極集電体１３０の貫通孔とに挿入されて、かしめられることにより、負極集電体１３０とともに蓋体１１０に固定される。   Specifically, the positive electrode terminal 200 is fixed to the lid body 110 together with the positive electrode current collector 120 by rivets being inserted into the through holes of the lid body 110 and the through holes of the positive electrode current collector 120 and caulked. The The negative electrode terminal 300 is fixed to the lid body 110 together with the negative electrode current collector 130 by rivets being inserted into the through holes of the lid body 110 and the through holes of the negative electrode current collector 130 and caulked.

なお、正極端子２００と蓋体１１０との間、正極集電体１２０と蓋体１１０との間、負極端子３００と蓋体１１０との間、及び負極集電体１３０と蓋体１１０との間には、パッキン等も配置されているが、同図では省略して図示している。   Note that, between the positive electrode terminal 200 and the lid body 110, between the positive electrode current collector 120 and the lid body 110, between the negative electrode terminal 300 and the lid body 110, and between the negative electrode current collector 130 and the lid body 110. In the figure, packing and the like are also arranged, but are omitted from the drawing.

正極集電体１２０は、電極体１４０の正極（正極側端部１４０ａ）と容器１００の本体１１１の側壁との間に配置され、正極端子２００と電極体１４０の正極とに電気的に接続される導電性と剛性とを備えた部材である。なお、正極集電体１２０は、電極体１４０の正極基材層と同様、アルミニウムまたはアルミニウム合金などで形成されている。   The positive electrode current collector 120 is disposed between the positive electrode (positive electrode side end portion 140 a) of the electrode body 140 and the side wall of the main body 111 of the container 100, and is electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 140. This is a member having electrical conductivity and rigidity. The positive electrode current collector 120 is made of aluminum, an aluminum alloy, or the like, like the positive electrode base material layer of the electrode body 140.

負極集電体１３０は、電極体１４０の負極（負極側端部１４０ｂ）と容器１００の本体１１１の側壁との間に配置され、負極端子３００と電極体１４０の負極とに電気的に接続される導電性と剛性とを備えた部材である。なお、負極集電体１３０は、電極体１４０の負極基材層と同様、銅または銅合金などで形成されている。   The negative electrode current collector 130 is disposed between the negative electrode (negative electrode side end portion 140 b) of the electrode body 140 and the side wall of the main body 111 of the container 100, and is electrically connected to the negative electrode terminal 300 and the negative electrode of the electrode body 140. This is a member having electrical conductivity and rigidity. The negative electrode current collector 130 is made of copper, a copper alloy, or the like, like the negative electrode base material layer of the electrode body 140.

スペーサ５１０及び５２０は、電極体１４０と容器１００との間に配置され、電極体１４０と容器１００との間の空間を埋めるための絶縁性の部材である。   The spacers 510 and 520 are disposed between the electrode body 140 and the container 100 and are insulating members for filling the space between the electrode body 140 and the container 100.

具体的には、スペーサ５１０は、電極体１４０の正極側（Ｘ軸方向マイナス側）、つまり、電極体１４０の正極及び正極集電体１２０と容器１００の本体１１１の側壁との間に配置されている。つまり、スペーサ５１０は、電極体１４０の正極及び正極集電体１２０と容器１００の本体１１１の側壁との間の空間を埋めるための部材である。   Specifically, the spacer 510 is disposed on the positive electrode side (X-axis direction negative side) of the electrode body 140, that is, between the positive electrode of the electrode body 140 and the positive electrode current collector 120 and the side wall of the main body 111 of the container 100. ing. That is, the spacer 510 is a member for filling a space between the positive electrode of the electrode body 140 and the positive electrode current collector 120 and the side wall of the main body 111 of the container 100.

また、スペーサ５２０は、電極体１４０の負極側（Ｘ軸方向プラス側）、つまり、電極体１４０の負極及び負極集電体１３０と容器１００の本体１１１の側壁との間に配置されている。つまり、スペーサ５２０は、電極体１４０の負極及び負極集電体１３０と容器１００の本体１１１の側壁との間の空間を埋めるための部材である。   In addition, the spacer 520 is disposed on the negative electrode side (X-axis direction plus side) of the electrode body 140, that is, between the negative electrode and negative electrode current collector 130 of the electrode body 140 and the side wall of the main body 111 of the container 100. That is, the spacer 520 is a member for filling a space between the negative electrode and the negative electrode current collector 130 of the electrode body 140 and the side wall of the main body 111 of the container 100.

さらに具体的には、スペーサ５１０は、正極集電体１２０のＸ軸方向マイナス側に、正極集電体１２０と容器１００の本体１１１の側壁とで挟まれ、かつ当該側壁に沿って延びるように配置されている。また、スペーサ５２０は、負極集電体１３０のＸ軸方向プラス側に、負極集電体１３０と容器１００の本体１１１の側壁とで挟まれ、かつ当該側壁に沿って延びるように配置されている。   More specifically, the spacer 510 is sandwiched between the positive electrode current collector 120 and the side wall of the main body 111 of the container 100 on the negative side in the X-axis direction of the positive electrode current collector 120 and extends along the side wall. Has been placed. The spacer 520 is disposed on the positive side in the X-axis direction of the negative electrode current collector 130 so as to be sandwiched between the negative electrode current collector 130 and the side wall of the main body 111 of the container 100 and to extend along the side wall. .

つまり、スペーサ５１０とスペーサ５２０とは、電極体１４０をＸ軸方向の両端から挟み込むように、電極体１４０の両端と容器１００の本体１１１の両側壁との間に配置されている。   That is, the spacer 510 and the spacer 520 are disposed between both ends of the electrode body 140 and both side walls of the main body 111 of the container 100 so as to sandwich the electrode body 140 from both ends in the X-axis direction.

ここで、スペーサ５１０、５２０は、例えばポリプロピレン（ＰＰ）、ポリフェニレンサルファイド（ＰＰＳ）、ポリエチレンテレフタラート（ＰＥＴ）、セラミック、及びそれらの複合材料などの絶縁性の材料で形成されている。つまり、スペーサ５１０、５２０は、電極体１４０、正極集電体１２０及び負極集電体１３０と容器１００とを絶縁する。また、スペーサ５１０、５２０は、電極体１４０、正極集電体１２０及び負極集電体１３０と容器１００との間のスペースを埋めることにより、電極体１４０、正極集電体１２０及び負極集電体１３０が容器１００に対して振動しないように支持する。   Here, the spacers 510 and 520 are made of an insulating material such as polypropylene (PP), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), ceramic, and a composite material thereof. That is, the spacers 510 and 520 insulate the electrode body 140, the positive electrode current collector 120 and the negative electrode current collector 130 from the container 100. Further, the spacers 510 and 520 fill the space between the electrode body 140, the positive electrode current collector 120 and the negative electrode current collector 130 and the container 100, so that the electrode body 140, the positive electrode current collector 120 and the negative electrode current collector are filled. 130 supports the container 100 so as not to vibrate.

次に、導電性部材４１０及び金属箔４２０の構成及び配置について、詳細に説明する。   Next, the configuration and arrangement of the conductive member 410 and the metal foil 420 will be described in detail.

図４は、本発明の実施の形態に係る蓄電素子１０を側方から見た場合の内部構成を示す平面図である。なお、同図は、容器１００の本体１１１を透過して容器１００の内部を示した図である。   FIG. 4 is a plan view showing an internal configuration when power storage element 10 according to the embodiment of the present invention is viewed from the side. In addition, the figure is a figure which permeate | transmitted the main body 111 of the container 100, and showed the inside of the container 100. FIG.

また、図５は、本発明の実施の形態に係る導電性部材４１０及び金属箔４２０の正極側の構成及び配置を示す断面図である。具体的には、同図は、図４に示された蓄電素子１０の正極側（Ｘ軸方向マイナス側）をＡ−Ａ断面で切断した場合の断面を示す図である。   Moreover, FIG. 5 is sectional drawing which shows the structure and arrangement | positioning by the side of the positive electrode of the electroconductive member 410 and the metal foil 420 which concern on embodiment of this invention. Specifically, FIG. 4 is a view showing a cross section when the positive electrode side (X-axis direction negative side) of the electricity storage device 10 shown in FIG. 4 is cut along the AA cross section.

また、図６は、本発明の実施の形態に係る導電性部材４１０及び金属箔４２０の負極側の構成及び配置を示す断面図である。具体的には、同図は、図４に示された蓄電素子１０の負極側（Ｘ軸方向プラス側）をＢ−Ｂ断面で切断した場合の断面を示す図である。   Moreover, FIG. 6 is sectional drawing which shows the structure and arrangement | positioning by the side of the negative electrode of the electroconductive member 410 and the metal foil 420 which concern on embodiment of this invention. Specifically, FIG. 4 is a view showing a cross section when the negative electrode side (X-axis direction plus side) of the electricity storage device 10 shown in FIG. 4 is cut along the BB cross section.

これらの図に示すように、導電性部材４１０は、電極体１４０と容器１００との間に配置される部材である。具体的には、導電性部材４１０は、電極体１４０と容器１００の長側面との間、つまり、電極体１４０上に配置された金属箔４２０と容器１００の本体１１１の長側面との間に配置されている。   As shown in these drawings, the conductive member 410 is a member disposed between the electrode body 140 and the container 100. Specifically, the conductive member 410 is provided between the electrode body 140 and the long side surface of the container 100, that is, between the metal foil 420 disposed on the electrode body 140 and the long side surface of the main body 111 of the container 100. Has been placed.

さらに具体的には、導電性部材４１０は、内面（電極体１４０側の面）が金属箔４２０の外面（容器１００側の面）に当接し、外面（容器１００側の面）が容器１００の本体１１１の内面に当接して、配置されている。   More specifically, the conductive member 410 has an inner surface (surface on the electrode body 140 side) in contact with an outer surface (surface on the container 100 side) of the metal foil 420 and an outer surface (surface on the container 100 side) of the container 100. It is disposed in contact with the inner surface of the main body 111.

ここで、本実施の形態では、導電性部材４１０は、導電性フィルムである。つまり、導電性部材４１０は、絶縁性材料を含有した導電性を有する部材である。具体的には、導電性部材４１０は、導電性の部材が所定の割合で混合された樹脂から形成された高抵抗の導電性部材である。   Here, in the present embodiment, the conductive member 410 is a conductive film. That is, the conductive member 410 is a conductive member containing an insulating material. Specifically, the conductive member 410 is a high-resistance conductive member formed from a resin in which conductive members are mixed at a predetermined ratio.

例えば、導電性部材４１０は、ポリプロピレン（ＰＰ）、ポリフェニレンサルファイド（ＰＰＳ）、ポリエチレンテレフタラート（ＰＥＴ）などの樹脂に、金属粒子などの導電性の部材を満遍なく混合させることで形成されたフィルム状のシートである。なお、導電性部材４１０の材質や混合割合は限定されず、高抵抗の導電性部材であればどのような材質や混合割合で形成されていてもかまわない。   For example, the conductive member 410 is a film formed by uniformly mixing a conductive member such as metal particles in a resin such as polypropylene (PP), polyphenylene sulfide (PPS), or polyethylene terephthalate (PET). It is a sheet. In addition, the material and mixing ratio of the conductive member 410 are not limited, and any material and mixing ratio may be used as long as it is a high resistance conductive member.

また、導電性部材４１０の抵抗値は１Ω以上が好ましい。この値よりも小さいと、短絡時に大電流が流れてしまうので好ましくない。   The resistance value of the conductive member 410 is preferably 1Ω or more. If it is smaller than this value, a large current flows at the time of a short circuit, which is not preferable.

また、導電性部材４１０は、正極集電体１２０と負極集電体１３０との間に配置されている。具体的には、導電性部材４１０は、電極体１４０の正極に電気的に接続される正極集電体１２０との距離の方が、電極体１４０の負極に電気的に接続される負極集電体１３０との距離よりも近くなるように配置されている。   In addition, the conductive member 410 is disposed between the positive electrode current collector 120 and the negative electrode current collector 130. Specifically, the conductive member 410 is arranged such that the distance between the conductive member 410 and the positive electrode current collector 120 electrically connected to the positive electrode of the electrode body 140 is electrically connected to the negative electrode of the electrode body 140. It arrange | positions so that it may become nearer than the distance with the body 130.

つまり、導電性部材４１０は、図５に示された正極集電体１２０との距離Ｐ１の方が、図６に示された負極集電体１３０との距離Ｑ１よりも近くなるように（距離Ｐ１の方が距離Ｑ１よりも小さくなるように）、配置されている。   That is, the conductive member 410 is such that the distance P1 from the positive electrode current collector 120 shown in FIG. 5 is closer to the distance Q1 from the negative electrode current collector 130 shown in FIG. (P1 is smaller than the distance Q1).

ここで、正極集電体１２０は、電極体１４０の正極側端部１４０ａに接合されている。つまり、正極集電体１２０は、電極体１４０の正極側端部１４０ａに沿って延びる長尺状の電極体接続部１２１、１２２を有している。また、正極側端部１４０ａは、電極体１４０の巻回軸を中心にして二分された正極基材層の束である正極側端部１４１ａ、１４２ａを有している。そして、電極体接続部１２１は正極側端部１４１ａに接合され、電極体接続部１２２は正極側端部１４２ａに接合されている。   Here, the positive electrode current collector 120 is joined to the positive electrode side end portion 140 a of the electrode body 140. That is, the positive electrode current collector 120 has elongated electrode body connection portions 121 and 122 extending along the positive electrode side end portion 140 a of the electrode body 140. Further, the positive electrode side end portion 140 a includes positive electrode side end portions 141 a and 142 a that are bundles of the positive electrode base material layer divided into two around the winding axis of the electrode body 140. And the electrode body connection part 121 is joined to the positive electrode side edge part 141a, and the electrode body connection part 122 is joined to the positive electrode side edge part 142a.

また、負極集電体１３０は、電極体１４０の負極側端部１４０ｂに接合されている。つまり、負極集電体１３０は、電極体１４０の負極側端部１４０ｂに沿って延びる長尺状の電極体接続部１３１、１３２を有している。また、負極側端部１４０ｂは、電極体１４０の巻回軸を中心にして二分された負極基材層の束である負極側端部１４１ｂ、１４２ｂを有している。そして、電極体接続部１３１は負極側端部１４１ｂに接合され、電極体接続部１３２は負極側端部１４２ｂに接合されている。   The negative electrode current collector 130 is bonded to the negative electrode side end portion 140 b of the electrode body 140. That is, the negative electrode current collector 130 has long electrode body connection portions 131 and 132 that extend along the negative electrode side end portion 140 b of the electrode body 140. Further, the negative electrode side end portion 140 b has negative electrode side end portions 141 b and 142 b which are bundles of the negative electrode base material layer divided into two around the winding axis of the electrode body 140. The electrode body connecting portion 131 is joined to the negative electrode side end portion 141b, and the electrode body connecting portion 132 is joined to the negative electrode side end portion 142b.

また、導電性部材４１０は、正極側のスペーサ５１０と負極側のスペーサ５２０との間に配置されている。つまり、導電性部材４１０は、スペーサ５１０との距離の方が、スペーサ５２０との距離よりも近くなるように配置されている。   The conductive member 410 is disposed between the positive-side spacer 510 and the negative-side spacer 520. That is, the conductive member 410 is disposed such that the distance from the spacer 510 is closer to the distance from the spacer 520.

ここで、スペーサ５１０は、電極体１４０の正極側端部１４０ａ及び正極集電体１２０を覆うように配置されている。つまり、スペーサ５１０は、正極側端部１４１ａ及び１４２ａに接合された電極体接続部１２１及び１２２を、両側から挟み込むように配置されている。なお、詳細には、スペーサ５１０は、正極集電体１２０を覆う金属箔４２０をさらに覆うように配置されている。また、スペーサ５１０は、容器１００の本体１１１の内壁に当接して配置されている。   Here, the spacer 510 is disposed so as to cover the positive electrode side end portion 140 a of the electrode body 140 and the positive electrode current collector 120. That is, the spacer 510 is disposed so as to sandwich the electrode body connecting portions 121 and 122 joined to the positive electrode side end portions 141a and 142a from both sides. Specifically, the spacer 510 is disposed so as to further cover the metal foil 420 that covers the positive electrode current collector 120. The spacer 510 is disposed in contact with the inner wall of the main body 111 of the container 100.

また、スペーサ５２０は、電極体１４０の負極側端部１４０ｂ及び負極集電体１３０を覆うように配置されている。つまり、スペーサ５２０は、負極側端部１４１ｂ及び１４２ｂに接合された電極体接続部１３１及び１３２を、両側から挟み込むように配置されている。また、スペーサ５２０は、容器１００の本体１１１の内壁に当接して配置されている。   The spacer 520 is disposed so as to cover the negative electrode side end portion 140 b of the electrode body 140 and the negative electrode current collector 130. That is, the spacer 520 is disposed so as to sandwich the electrode body connection portions 131 and 132 joined to the negative electrode side end portions 141b and 142b from both sides. The spacer 520 is disposed in contact with the inner wall of the main body 111 of the container 100.

金属箔４２０は、導電性部材４１０と電極体１４０との間に配置される金属箔である。具体的には、金属箔４２０は、電極体１４０と容器１００の長側面との間、つまり、電極体１４０と導電性部材４１０との間に配置されている。   The metal foil 420 is a metal foil disposed between the conductive member 410 and the electrode body 140. Specifically, the metal foil 420 is disposed between the electrode body 140 and the long side surface of the container 100, that is, between the electrode body 140 and the conductive member 410.

また、金属箔４２０は、端部が、正極集電体１２０とスペーサ５１０との間に配置されている。具体的には、金属箔４２０は、端部が、正極集電体１２０の電極体接続部１２１及び１２２の全体を覆うように、電極体接続部１２１及び１２２とスペーサ５１０との間に配置されている。つまり、金属箔４２０は、端部が、正極集電体１２０の電極体接続部１２１及び１２２と接続されている。   Further, the end of the metal foil 420 is disposed between the positive electrode current collector 120 and the spacer 510. Specifically, the metal foil 420 is disposed between the electrode body connection portions 121 and 122 and the spacer 510 so that the end portion covers the entire electrode body connection portions 121 and 122 of the positive electrode current collector 120. ing. That is, the end portion of the metal foil 420 is connected to the electrode body connecting portions 121 and 122 of the positive electrode current collector 120.

さらに具体的には、金属箔４２０は、内面（電極体１４０側の面）が電極体１４０の外面と正極集電体１２０の電極体接続部１２１及び１２２とに当接し、外面（容器１００側の面）が導電性部材４１０の内面（電極体１４０側の面）とスペーサ５１０とに当接して、配置されている。   More specifically, the metal foil 420 has an inner surface (surface on the electrode body 140 side) in contact with the outer surface of the electrode body 140 and the electrode body connection portions 121 and 122 of the positive electrode current collector 120, and the outer surface (the container 100 side). Are disposed in contact with the inner surface of the conductive member 410 (the surface on the electrode body 140 side) and the spacer 510.

ここで、電極体１４０の外面にはセパレータが配置されているが、金属箔４２０は、正極集電体１２０の電極体接続部１２１及び１２２を介して、電極体１４０の正極と電気的に接続される。なお、金属箔４２０は、金属製の箔状部材であれば材質は限定されないが、アルミニウムまたはアルミニウム合金など、電極体１４０の正極基材層や正極集電体１２０と同等の材質であるのが好ましい。   Here, a separator is disposed on the outer surface of the electrode body 140, but the metal foil 420 is electrically connected to the positive electrode of the electrode body 140 via the electrode body connection portions 121 and 122 of the positive electrode current collector 120. Is done. The material of the metal foil 420 is not limited as long as it is a metal foil-like member, but the material is the same as that of the positive electrode base layer of the electrode body 140 and the positive electrode current collector 120 such as aluminum or aluminum alloy. preferable.

これにより、導電性部材４１０と電極体１４０とは、金属箔４２０と正極集電体１２０とを介して電気的に接続される。そして、導電性部材４１０は高抵抗の導電性部材であるため、電極体１４０と容器１００とは、導電性部材４１０を介して電気的に接続される。具体的には、導電性部材４１０は、電極体１４０の正極と容器１００とを電気的に接続する。   As a result, the conductive member 410 and the electrode body 140 are electrically connected via the metal foil 420 and the positive electrode current collector 120. Since the conductive member 410 is a high-resistance conductive member, the electrode body 140 and the container 100 are electrically connected via the conductive member 410. Specifically, the conductive member 410 electrically connects the positive electrode of the electrode body 140 and the container 100.

また、金属箔４２０は、正極集電体１２０と負極集電体１３０との間に配置され、また、正極側のスペーサ５１０と負極側のスペーサ５２０との間に配置されている。なお、金属箔４２０は、負極集電体１３０とスペーサ５２０との間には配置されていない。このため、金属箔４２０は、導電性部材４１０と同様、正極集電体１２０との距離の方が負極集電体１３０との距離よりも近くなるように配置され、また、スペーサ５１０との距離の方が、スペーサ５２０との距離よりも近くなるように配置されている。   The metal foil 420 is disposed between the positive electrode current collector 120 and the negative electrode current collector 130, and is disposed between the positive electrode side spacer 510 and the negative electrode side spacer 520. Note that the metal foil 420 is not disposed between the negative electrode current collector 130 and the spacer 520. Therefore, like the conductive member 410, the metal foil 420 is disposed such that the distance from the positive electrode current collector 120 is closer than the distance from the negative electrode current collector 130 and the distance from the spacer 510. Is arranged so as to be closer than the distance to the spacer 520.

以上のように、本発明の実施の形態に係る蓄電素子１０によれば、電極体１４０と容器１００とは、電極体１４０と容器１００との間に配置された導電性部材４１０を介して、電気的に接続されている。ここで、導電性部材４１０は、絶縁性材料を基材とした導電性を有する部材であるため、高抵抗の導電性部材である。このため、電極体１４０の正極と負極とが容器１００を介して短絡した場合でも、電極体１４０と容器１００とは高抵抗の導電性部材である導電性部材４１０を介して電気的に接続されていることから、電極体１４０から容器１００へ大電流が流れるのを抑制することができる。   As described above, according to the electricity storage device 10 according to the embodiment of the present invention, the electrode body 140 and the container 100 are connected via the conductive member 410 disposed between the electrode body 140 and the container 100. Electrically connected. Here, since the conductive member 410 is a conductive member having an insulating material as a base material, it is a high-resistance conductive member. For this reason, even when the positive electrode and the negative electrode of the electrode body 140 are short-circuited via the container 100, the electrode body 140 and the container 100 are electrically connected via the conductive member 410, which is a high-resistance conductive member. Therefore, it is possible to suppress a large current from flowing from the electrode body 140 to the container 100.

また、導電性部材４１０は、導電性の部材が所定の割合で混合された樹脂から形成されているため、導電性の部材を所定の割合で樹脂に混合することで、簡易に、導電性部材４１０を形成することができる。   In addition, since the conductive member 410 is formed of a resin in which conductive members are mixed at a predetermined ratio, the conductive member 410 can be easily mixed by mixing the conductive member with the resin at a predetermined ratio. 410 can be formed.

また、電極体１４０と容器１００の短側面との間は、スペースが広く空いている場合が多く、そこに導電性部材４１０を配置する場合には、導電性部材４１０の厚さを厚くする必要があるため、導電性部材４１０の重量アップやコストアップにつながる。これに対し、電極体１４０は、容器１００の長側面に当接するように配置されるため、導電性部材４１０を電極体１４０と容器１００の長側面との間に配置することで、導電性部材４１０として厚みの薄い導電性フィルムを用いることができる。   In addition, there is often a large space between the electrode body 140 and the short side surface of the container 100, and when the conductive member 410 is disposed there, it is necessary to increase the thickness of the conductive member 410. Therefore, the conductive member 410 is increased in weight and cost. On the other hand, since the electrode body 140 is disposed so as to contact the long side surface of the container 100, the conductive member 410 is disposed between the electrode body 140 and the long side surface of the container 100. A thin conductive film can be used as 410.

また、導電性部材４１０は、電極体１４０の正極と電気的に接続されており、正極集電体１２０との距離の方が負極集電体１３０との距離よりも近くなるように配置されている。つまり、導電性部材４１０は、電極体１４０の正極と導通しているため、電極体１４０の負極と導通しないように、負極側から離して配置されている。これにより、電極体１４０の正極と負極とが導電性部材４１０を介して短絡するのを抑制することができる。   In addition, the conductive member 410 is electrically connected to the positive electrode of the electrode body 140 and is disposed so that the distance from the positive electrode current collector 120 is closer than the distance from the negative electrode current collector 130. Yes. That is, since the conductive member 410 is electrically connected to the positive electrode of the electrode body 140, the conductive member 410 is disposed away from the negative electrode side so as not to be electrically connected to the negative electrode of the electrode body 140. Thereby, it is possible to suppress a short circuit between the positive electrode and the negative electrode of the electrode body 140 via the conductive member 410.

また、導電性部材４１０と電極体１４０との間に金属箔４２０を配置することで、容易に、電極体１４０と導電性部材４１０とを電気的に接続することができる。   In addition, by disposing the metal foil 420 between the conductive member 410 and the electrode body 140, the electrode body 140 and the conductive member 410 can be easily electrically connected.

（変形例１）
次に、上記実施の形態の変形例１について、説明する。 (Modification 1)
Next, Modification 1 of the above embodiment will be described.

図７は、本発明の実施の形態の変形例１に係る蓄電素子１１の構成を示す平面図である。なお、同図は、蓄電素子１１を側方から見た場合の内部構成を示す図であり、容器１００の本体１１１を透過して容器１００の内部を示している。   FIG. 7 is a plan view showing a configuration of power storage element 11 according to Modification 1 of the embodiment of the present invention. In addition, the figure is a figure which shows the internal structure at the time of seeing the electrical storage element 11 from the side, and permeate | transmits the main body 111 of the container 100, and has shown the inside of the container 100.

上記実施の形態では、導電性部材４１０は、正極集電体１２０との距離の方が負極集電体１３０との距離よりも近くなるように配置されていることとした。しかし、本変形例では、同図に示すように、蓄電素子１１が有する導電性部材４１１は、正極集電体１２０との距離の方が、負極集電体１３０との距離よりも遠くなるように配置されている。   In the above embodiment, the conductive member 410 is arranged such that the distance from the positive electrode current collector 120 is closer to the distance from the negative electrode current collector 130. However, in this modification, as shown in the figure, the conductive member 411 included in the power storage element 11 is arranged such that the distance from the positive electrode current collector 120 is longer than the distance from the negative electrode current collector 130. Is arranged.

つまり、導電性部材４１１は、正極集電体１２０との距離Ｐ２の方が、負極集電体１３０との距離Ｑ２よりも遠くなるように（距離Ｐ２の方が距離Ｑ２よりも大きくなるように）、配置されている。   That is, the conductive member 411 is such that the distance P2 from the positive electrode current collector 120 is longer than the distance Q2 from the negative electrode current collector 130 (the distance P2 is larger than the distance Q2). ).

なお、蓄電素子１１が有する導電性部材４１１以外の構成においては、上記実施の形態における蓄電素子１０が有する構成と同様であるため、説明は省略する。   Note that the configuration other than the conductive member 411 included in the power storage element 11 is the same as the configuration included in the power storage element 10 in the above embodiment, and thus description thereof is omitted.

以上のように、本発明の実施の形態の変形例１に係る蓄電素子１１によれば、上記実施の形態と同様の効果を奏する。特に、導電性部材４１１の面積を自由に変更可能であるため、電極体１４０と容器１００との間の抵抗値を容易に制御することができる。   As described above, according to power storage element 11 according to the first modification of the embodiment of the present invention, the same effects as those of the above-described embodiment can be obtained. In particular, since the area of the conductive member 411 can be freely changed, the resistance value between the electrode body 140 and the container 100 can be easily controlled.

（変形例２）
次に、上記実施の形態の変形例２について、説明する。 (Modification 2)
Next, a second modification of the above embodiment will be described.

図８は、本発明の実施の形態の変形例２に係る蓄電素子１２の構成を示す断面図である。具体的には、同図は、蓄電素子１２の正極側（Ｘ軸方向マイナス側）をＸＹ平面に平行な平面で切断した場合の断面を示す図である。   FIG. 8 is a cross-sectional view showing a configuration of power storage element 12 according to Modification 2 of the embodiment of the present invention. Specifically, this figure is a diagram showing a cross section when the positive electrode side (X-axis direction negative side) of the electricity storage element 12 is cut along a plane parallel to the XY plane.

同図に示すように、蓄電素子１２は、上記実施の形態における蓄電素子１０の金属箔４２０に代えて、金属箔４３０を有している。なお、蓄電素子１２が有する金属箔４３０以外の構成においては、上記実施の形態における蓄電素子１０が有する構成と同様であるため、説明は省略する。   As shown in the figure, the electricity storage element 12 has a metal foil 430 instead of the metal foil 420 of the electricity storage element 10 in the above embodiment. Note that the configuration other than the metal foil 430 included in the power storage element 12 is the same as the configuration included in the power storage element 10 in the above embodiment, and a description thereof will be omitted.

金属箔４３０は、電極体１４０の正極に電気的に接続される正極集電体１２０と電極体１４０との間に配置されるとともに、電極体１４０の最外周のセパレータと導電性部材４１０との間に配置されている。   The metal foil 430 is disposed between the positive electrode current collector 120 electrically connected to the positive electrode of the electrode body 140 and the electrode body 140, and between the separator on the outermost periphery of the electrode body 140 and the conductive member 410. Arranged between.

具体的には、金属箔４３０は、電極体１４０の正極側端部１４０ａの正極側端部１４１ａと正極集電体１２０の電極体接続部１２１との間に配置され、正極側端部１４１ａ及び電極体接続部１２１とともに接合されている。また、金属箔４３０は、正極側端部１４０ａの正極側端部１４２ａと正極集電体１２０の電極体接続部１２２との間に配置され、正極側端部１４２ａ及び電極体接続部１２２とともに接合されている。   Specifically, the metal foil 430 is disposed between the positive electrode side end portion 141a of the positive electrode side end portion 140a of the electrode body 140 and the electrode body connection portion 121 of the positive electrode current collector 120, and the positive electrode side end portion 141a and It is joined together with the electrode body connecting portion 121. The metal foil 430 is disposed between the positive electrode side end portion 142 a of the positive electrode side end portion 140 a and the electrode body connection portion 122 of the positive electrode current collector 120, and is bonded together with the positive electrode side end portion 142 a and the electrode body connection portion 122. Has been.

また、上記実施の形態と同様に、電極体１４０の最外周にはセパレータが配置されており、金属箔４３０は、当該セパレータと導電性部材４１０との間に配置されている。   Similarly to the above embodiment, a separator is disposed on the outermost periphery of the electrode body 140, and the metal foil 430 is disposed between the separator and the conductive member 410.

これにより、上記実施の形態と同様に、電極体１４０の最外周がセパレータの場合において、金属箔４３０を介して、電極体１４０の正極と導電性部材４１０とを電気的に接続することができる。   Thereby, similarly to the said embodiment, when the outermost periphery of the electrode body 140 is a separator, the positive electrode of the electrode body 140 and the electroconductive member 410 can be electrically connected via the metal foil 430. .

また、金属箔４３０は、電極体１４０と一体に形成されていてもよい。つまり、図９に示すように、金属箔４３０として電極体１４０の最外周の正極基材層を用いることで、電極体１４０の正極と導電性部材４１０とを電気的に接続することができる。図９は、本発明の実施の形態の変形例２の他の例に係る電極体１４０の構成を示す斜視図である。具体的には、同図は、巻回された電極体１４０の最外周を展開した状態を示す図である。   Further, the metal foil 430 may be formed integrally with the electrode body 140. That is, as shown in FIG. 9, by using the positive electrode base layer on the outermost periphery of the electrode body 140 as the metal foil 430, the positive electrode of the electrode body 140 and the conductive member 410 can be electrically connected. FIG. 9 is a perspective view showing a configuration of an electrode body 140 according to another example of the second modification of the embodiment of the present invention. Specifically, the drawing shows a state where the outermost periphery of the wound electrode body 140 is developed.

つまり、図９に示すように、電極体１４０は、正極１４１、セパレータ１４２及び負極１４３を有している。そして、正極１４１は、電極体１４０の最外周に相当する部分に、正極活物質が塗布されていない正極基材層である金属箔４３０を有している。つまり、正極活物質を塗布することなく正極基材層を延長することで、金属箔４３０を有する正極１４１を形成することができる。   That is, as shown in FIG. 9, the electrode body 140 includes a positive electrode 141, a separator 142, and a negative electrode 143. And the positive electrode 141 has the metal foil 430 which is a positive electrode base material layer in which the positive electrode active material is not apply | coated to the part corresponded to the outermost periphery of the electrode body 140. FIG. That is, the positive electrode 141 having the metal foil 430 can be formed by extending the positive electrode base material layer without applying the positive electrode active material.

これにより、電極体１４０が巻回された状態において金属箔４３０が最外周に位置するため、図８に示された構成と同様の構成を実現することができる。   Thereby, since the metal foil 430 is located on the outermost periphery in a state where the electrode body 140 is wound, a configuration similar to the configuration shown in FIG. 8 can be realized.

以上のように、本発明の実施の形態の変形例２に係る蓄電素子１２によれば、上記実施の形態と同様の効果を奏する。特に、正極集電体１２０と電極体１４０との間、かつ電極体１４０の最外周のセパレータと導電性部材４１０との間に金属箔４３０を配置することで、容易に、電極体１４０の正極と導電性部材４１０とを電気的に接続することができる。   As described above, according to power storage element 12 according to the second modification of the embodiment of the present invention, the same effects as those of the above-described embodiment can be obtained. In particular, by arranging the metal foil 430 between the positive electrode current collector 120 and the electrode body 140 and between the separator on the outermost periphery of the electrode body 140 and the conductive member 410, the positive electrode of the electrode body 140 can be easily formed. And the conductive member 410 can be electrically connected.

（変形例３）
次に、上記実施の形態の変形例３について、説明する。 (Modification 3)
Next, Modification 3 of the above embodiment will be described.

図１０は、本発明の実施の形態の変形例３に係る蓄電素子１３の構成を示す断面図である。具体的には、同図は、蓄電素子１３の正極側（Ｘ軸方向マイナス側）をＸＹ平面に平行な平面で切断した場合の断面を示す図である。   FIG. 10 is a cross-sectional view showing a configuration of power storage element 13 according to Modification 3 of the embodiment of the present invention. Specifically, this figure is a diagram showing a cross section when the positive electrode side (X-axis direction negative side) of the electricity storage element 13 is cut along a plane parallel to the XY plane.

同図に示すように、蓄電素子１３は、上記実施の形態における蓄電素子１０の導電性部材４１０及び金属箔４２０は有しておらず、また、スペーサ５１０に代えて、導電性部材４４０を有している。なお、蓄電素子１３が有する導電性部材４４０以外の構成においては、上記実施の形態における蓄電素子１０が有する構成と同様であるため、説明は省略する。   As shown in the figure, the power storage element 13 does not have the conductive member 410 and the metal foil 420 of the power storage element 10 in the above embodiment, and has a conductive member 440 instead of the spacer 510. doing. Note that the configuration other than the conductive member 440 included in the power storage element 13 is the same as the configuration included in the power storage element 10 in the above embodiment, and thus description thereof is omitted.

導電性部材４４０は、電極体１４０の正極に電気的に接続される正極集電体１２０と容器１００との間に配置されるスペーサである。つまり、導電性部材４４０は、電極体１４０の正極側端部１４０ａの正極側端部１４１ａ、１４２ａに接合された正極集電体１２０の電極体接続部１２１、１２２に当接するとともに、容器１００の本体１１１の内壁に当接して配置されている。   The conductive member 440 is a spacer disposed between the positive electrode current collector 120 that is electrically connected to the positive electrode of the electrode body 140 and the container 100. That is, the conductive member 440 contacts the electrode body connection portions 121 and 122 of the positive electrode current collector 120 joined to the positive electrode side ends 141a and 142a of the positive electrode side end portion 140a of the electrode body 140 and It is disposed in contact with the inner wall of the main body 111.

なお、導電性部材４４０は、上記実施の形態における蓄電素子１０の導電性部材４１０と同様の材質によって形成された高抵抗の導電性部材である。これにより、導電性部材４４０は、電極体１４０の正極と容器１００とを高抵抗で電気的に接続する。   Note that the conductive member 440 is a high-resistance conductive member formed of the same material as the conductive member 410 of the power storage element 10 in the above embodiment. Thereby, the conductive member 440 electrically connects the positive electrode of the electrode body 140 and the container 100 with high resistance.

以上のように、本発明の実施の形態の変形例３に係る蓄電素子１２によれば、上記実施の形態と同様の効果を奏する。特に、導電性部材４４０は、正極集電体１２０と容器１００との間に配置されるスペーサであるため、正極集電体１２０を介して電極体１４０の正極と容器１００とを電気的に接続することで、容易に、電極体１４０の正極と容器１００とを電気的に接続することができる。   As described above, according to power storage element 12 according to Modification 3 of the embodiment of the present invention, the same effects as those of the above-described embodiment can be obtained. In particular, since the conductive member 440 is a spacer disposed between the positive electrode current collector 120 and the container 100, the positive electrode of the electrode body 140 and the container 100 are electrically connected via the positive electrode current collector 120. By doing so, the positive electrode of the electrode body 140 and the container 100 can be electrically connected easily.

以上、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したが、本発明は、上記実施の形態及びその変形例に限定されるものではない。つまり、今回開示された実施の形態及びその変形例は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。   Although the power storage device according to the embodiment of the present invention and the modification thereof has been described above, the present invention is not limited to the above-described embodiment and the modification. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

例えば、上記実施の形態及びその変形例では、導電性部材及び金属箔は、電極体１４０の正極に電気的に接続されることとしたが、当該導電性部材または金属箔は、電極体１４０の負極に電気的に接続されることにしてもかまわない。ただし、容器１００の腐食防止等の観点から、当該導電性部材及び金属箔は、電極体１４０の正極に電気的に接続されるのが好ましい。   For example, in the above-described embodiment and the modification thereof, the conductive member and the metal foil are electrically connected to the positive electrode of the electrode body 140, but the conductive member or the metal foil is not connected to the electrode body 140. It may be electrically connected to the negative electrode. However, from the viewpoint of preventing corrosion of the container 100, it is preferable that the conductive member and the metal foil are electrically connected to the positive electrode of the electrode body 140.

また、上記実施の形態及びその変形例では、導電性部材及び金属箔は、電極体１４０の周りを囲うように配置されていることとしたが、当該導電性部材または金属箔は、電極体１４０の一部に当接する構成でもかまわない。   Moreover, in the said embodiment and its modification, although the electroconductive member and metal foil were arrange | positioned so that the circumference | surroundings of the electrode body 140 might be enclosed, the said electroconductive member or metal foil is the electrode body 140. It may be configured to abut against a part of.

また、上記実施の形態及びその変形例１では、金属箔４２０は、端部が、正極集電体１２０の電極体接続部１２１及び１２２の全体を覆うように配置されていることとしたが、金属箔４２０は、正極集電体１２０の電極体接続部１２１及び１２２の一部に当接する構成でもかまわない。   Moreover, in the said embodiment and its modification 1, although the metal foil 420 was arrange | positioned so that the edge part might cover the whole electrode body connection parts 121 and 122 of the positive electrode collector 120, The metal foil 420 may be configured to be in contact with part of the electrode body connecting portions 121 and 122 of the positive electrode current collector 120.

また、上記実施の形態及びその変形例では、導電性部材及び金属箔は、電極体１４０と容器１００の長側面との間に配置されることとした。しかし、導電性部材及び金属箔は、電極体１４０と容器１００の短側面との間、または、電極体１４０と容器１００の底面との間に配置される構成でもかまわない。   In the above embodiment and its modifications, the conductive member and the metal foil are disposed between the electrode body 140 and the long side surface of the container 100. However, the conductive member and the metal foil may be arranged between the electrode body 140 and the short side surface of the container 100 or between the electrode body 140 and the bottom surface of the container 100.

また、上記実施の形態及びその変形例では、導電性部材は、柔軟性の高いフィルム状の部材であることとしたが、導電性部材は、柔軟性の低い板状の部材などであってもよい。   Moreover, in the said embodiment and its modification, although the electroconductive member was a film-like member with high flexibility, even if an electroconductive member is a plate-like member with low flexibility, etc. Good.

また、上記実施の形態及びその変形例では、蓄電素子は、１つの電極体しか備えていないこととしたが、蓄電素子は、２つ以上の電極体を備えていることにしてもよい。   Moreover, in the said embodiment and its modification, although the electrical storage element was provided with only one electrode body, the electrical storage element may be provided with the 2 or more electrode body.

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。例えば、上記変形例１または２に、変形例３を加えた構成などでもかまわない。   Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention. For example, a configuration obtained by adding Modification 3 to Modification 1 or 2 may be used.

なお、本発明は、このような蓄電素子として実現することができるだけでなく、蓄電素子が備える導電性部材としても実現することができる。   Note that the present invention can be realized not only as such a power storage element, but also as a conductive member included in the power storage element.

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 power storage elements such as lithium ion secondary batteries.

１０、１１、１２、１３ 蓄電素子
１００ 容器
１１０ 蓋体
１１１ 本体
１２０ 正極集電体
１２１、１２２ 電極体接続部
１３０ 負極集電体
１３１、１３２ 電極体接続部
１４０ 電極体
１４０ａ、１４１ａ、１４２ａ 正極側端部
１４０ｂ、１４１ｂ、１４２ｂ 負極側端部
１４１ 正極
１４２ セパレータ
１４３ 負極
２００ 正極端子
３００ 負極端子
４１０、４１１、４４０ 導電性部材
４２０、４３０ 金属箔
５１０、５２０ スペーサ 10, 11, 12, 13 Storage element 100 Container 110 Lid body 111 Main body 120 Positive electrode current collector 121, 122 Electrode body connection part 130 Negative electrode current collector 131, 132 Electrode body connection part 140 Electrode body 140a, 141a, 142a Positive electrode side Ends 140b, 141b, 142b Negative electrode side end 141 Positive electrode 142 Separator 143 Negative electrode 200 Positive electrode terminal 300 Negative electrode terminal 410, 411, 440 Conductive member 420, 430 Metal foil 510, 520 Spacer

Claims (7)

正極及び負極を有する電極体と、前記電極体が収容される容器とを備える蓄電素子であって、
前記電極体と前記容器との間に配置される部材であって、絶縁性材料を含有した導電性部材を備え、
前記電極体の前記正極または前記負極と前記容器とは、前記導電性部材を介して電気的に接続される
蓄電素子。 An electrical storage element comprising an electrode body having a positive electrode and a negative electrode, and a container in which the electrode body is accommodated,
A member disposed between the electrode body and the container, comprising a conductive member containing an insulating material;
The positive electrode or the negative electrode of the electrode body and the container are electrically connected via the conductive member. 前記導電性部材は、導電性の部材が所定の割合で混合された樹脂から形成されている
請求項１に記載の蓄電素子。 The electric storage element according to claim 1, wherein the conductive member is formed of a resin in which conductive members are mixed at a predetermined ratio. 前記導電性部材は、前記電極体と前記容器の長側面との間に配置される導電性フィルムである
請求項１または２に記載の蓄電素子。 The power storage device according to claim 1, wherein the conductive member is a conductive film disposed between the electrode body and a long side surface of the container. 前記導電性部材は、
前記電極体の正極と前記容器とを電気的に接続しており、
前記電極体の正極に電気的に接続される正極集電体との距離の方が、前記電極体の負極に電気的に接続される負極集電体との距離よりも近くなるように配置されている
請求項１〜３のいずれか１項に記載の蓄電素子。 The conductive member is
Electrically connecting the positive electrode of the electrode body and the container;
The electrode body is arranged such that the distance from the positive electrode current collector electrically connected to the positive electrode of the electrode body is closer than the distance from the negative electrode current collector electrically connected to the negative electrode of the electrode body. The electrical storage element of any one of Claims 1-3. さらに、
前記導電性部材と前記電極体との間に配置される金属箔を備え、
前記導電性部材と前記電極体とは、前記金属箔を介して電気的に接続される
請求項１〜４のいずれか１項に記載の蓄電素子。 further,
A metal foil disposed between the conductive member and the electrode body;
The electric storage element according to claim 1, wherein the conductive member and the electrode body are electrically connected via the metal foil. 前記金属箔は、前記電極体の正極に電気的に接続される正極集電体と前記電極体との間に配置されるとともに、前記電極体の最外周のセパレータと前記導電性部材との間に配置されている
請求項５に記載の蓄電素子。 The metal foil is disposed between a positive electrode current collector electrically connected to a positive electrode of the electrode body and the electrode body, and between the outermost separator of the electrode body and the conductive member. The electricity storage device according to claim 5, wherein 前記導電性部材は、前記電極体の正極に電気的に接続される正極集電体と前記容器との間に配置されるスペーサである
請求項１または２に記載の蓄電素子。 The electric storage element according to claim 1, wherein the conductive member is a spacer disposed between a positive electrode current collector electrically connected to a positive electrode of the electrode body and the container.
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JPH07245094A (en) * 1994-03-07 1995-09-19 Matsushita Electric Ind Co Ltd Organic electrolyte battery
JP2001068089A (en) * 1999-08-27 2001-03-16 Japan Storage Battery Co Ltd Battery
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