JP2018107122A - Energy storage element - Google Patents

Energy storage element Download PDF

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Publication number
JP2018107122A
JP2018107122A JP2017223120A JP2017223120A JP2018107122A JP 2018107122 A JP2018107122 A JP 2018107122A JP 2017223120 A JP2017223120 A JP 2017223120A JP 2017223120 A JP2017223120 A JP 2017223120A JP 2018107122 A JP2018107122 A JP 2018107122A
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Prior art keywords
negative electrode
electrode terminal
sealing member
conductive member
storage device
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Japanese (ja)
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憲利 前田
Noritoshi Maeda
憲利 前田
広和 上林
Hirokazu Kamibayashi
広和 上林
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GS Yuasa Corp
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GS Yuasa Corp
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Priority to KR1020170178306A priority Critical patent/KR20180075415A/en
Priority to US15/852,383 priority patent/US20180183018A1/en
Priority to DE102017223738.4A priority patent/DE102017223738A1/en
Priority to CN201711426552.9A priority patent/CN108242526A/en
Publication of JP2018107122A publication Critical patent/JP2018107122A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an energy storage element that reduces cost for suppressing corrosion between dissimilar metals.SOLUTION: A power storage element 100 includes: a negative electrode terminal 41 as a first conductive member; a negative electrode current collecting member 44 arranged to pass through a lid body 12 as a wall portion of a container 10, the negative electrode current collecting member 44 being electrically connected to an electrode assembly 20 and connected to the negative electrode terminal 41, as a second conductive member; and a nonmetallic sealing member 45 disposed between the negative electrode terminal 41 and the negative electrode current collecting member 44. The negative electrode terminal 41 and the negative electrode current collecting member 44 are in direct contact, and are made of mutually different metal materials. The sealing member 45 is disposed at a contact interface of the negative electrode terminal 41 and the negative electrode current collecting member 44.SELECTED DRAWING: Figure 5A

Description

本発明は、電極体と電気的に接続される導電部材を備える蓄電素子に関する。   The present invention relates to a power storage device including a conductive member electrically connected to an electrode body.

リチウムイオン二次電池等の蓄電素子には、正極及び負極を含む電極体が、導電部材（集電部材とも呼ばれる）を介して電極端子に接続されるものがある。例えば、特許文献１には、電極体としての電極組立体と電極端子とを電気的に連結する集電部材を、導電部材として備える二次電池が記載されている。集電部材と電極端子とは互いに異なる材料から形成されている。さらに、シールモールディングが、集電部材と電極端子との結合部を覆い包むように設けられている。   Some power storage elements such as lithium ion secondary batteries have an electrode body including a positive electrode and a negative electrode connected to an electrode terminal via a conductive member (also referred to as a current collecting member). For example, Patent Document 1 describes a secondary battery including, as a conductive member, a current collecting member that electrically connects an electrode assembly as an electrode body and an electrode terminal. The current collecting member and the electrode terminal are made of different materials. Further, a seal molding is provided so as to cover the coupling portion between the current collecting member and the electrode terminal.

特開２０１５−１４１８９６号公報Japanese Patent Laying-Open No. 2015-141896

特許文献１に記載される二次電池では、集電部材及び電極端子が、電極ユニットを構成し、電極ユニットは、電極組立体のケースのキャッププレートを貫通する。シールモールディングは、電極ユニットとキャッププレートとの間に介在して設けられる。シールモールディングは、モールディング樹脂により形成され、具体的には、インサート射出成形で形成される。このようなシールモールディングは、互いに異なる異種金属間の界面を含む結合部を覆って保護し、水分の浸透を遮断することにより、異種金属界面の腐食（ガルバニック腐食とも呼ばれる）を抑制する。しかしながら、シールモールディングを成形するための金型は、集電部材、電極端子、集電部材及び電極端子の結合部、並びにキャッププレート等の形状又は寸法が変化する毎に、これらに対応する形状及び寸法を有するように変更を受ける必要がある。これにより、コストが増大する。   In the secondary battery described in Patent Document 1, the current collecting member and the electrode terminal constitute an electrode unit, and the electrode unit penetrates the cap plate of the case of the electrode assembly. The seal molding is provided between the electrode unit and the cap plate. The seal molding is formed of a molding resin, and specifically is formed by insert injection molding. Such seal molding suppresses corrosion (also referred to as galvanic corrosion) of the dissimilar metal interface by covering and protecting the joint including the interface between different dissimilar metals and blocking moisture permeation. However, the mold for molding the seal molding has a shape and a corresponding shape each time the shape or dimensions of the current collecting member, the electrode terminal, the current collecting member and the electrode terminal coupling portion, and the cap plate change. It needs to be changed to have dimensions. This increases the cost.

本発明は、上述のような問題を解決するためになされたものであり、異種金属間の腐食を抑制する構成のコスト低減を図る蓄電素子を提供する。   The present invention has been made to solve the above-described problems, and provides a power storage device that reduces the cost of a configuration that suppresses corrosion between dissimilar metals.

本発明の一態様に係る蓄電素子は、電極体と、前記電極体を収容する容器と、第一の導電部材と、前記電極体と電気的に接続され且つ前記第一の導電部材と接続される第二の導電部材であって、前記容器の壁部を貫通して配置される第二の導電部材と、前記第一の導電部材と前記第二の導電部材との間に配置される非金属の封止部材とを備え、前記第一の導電部材と前記第二の導電部材とは、直接接触し、前記第一の導電部材及び前記第二の導電部材は、互いに異なる金属材料で構成され、前記封止部材は、前記第一の導電部材及び前記第二の導電部材の接触界面に配置される。   A power storage device according to one embodiment of the present invention includes an electrode body, a container that houses the electrode body, a first conductive member, and the electrode body that is electrically connected to and connected to the first conductive member. A second conductive member disposed through the wall of the container, and a non-conductive member disposed between the first conductive member and the second conductive member. A metal sealing member, wherein the first conductive member and the second conductive member are in direct contact, and the first conductive member and the second conductive member are made of different metal materials. The sealing member is disposed at a contact interface between the first conductive member and the second conductive member.

前記封止部材は、前記第一の導電部材及び前記第二の導電部材の接触界面の端部に配置されてもよい。   The sealing member may be disposed at an end portion of a contact interface between the first conductive member and the second conductive member.

前記第二の導電部材は、前記壁部を貫通する軸部と、前記軸部を前記壁部に固定する固定部とを含んでもよい。   The second conductive member may include a shaft portion that penetrates the wall portion and a fixing portion that fixes the shaft portion to the wall portion.

前記固定部は、前記軸部の端部の塑性変形部によって構成されてもよい。   The fixing portion may be configured by a plastic deformation portion at an end portion of the shaft portion.

前記封止部材は、前記第一の導電部材及び前記固定部が前記軸部の軸方向で隣接する部分に配置される第一の封止部材であってもよい。   The sealing member may be a first sealing member in which the first conductive member and the fixed portion are disposed in a portion adjacent to the shaft portion in the axial direction.

前記封止部材は、前記第一の導電部材及び前記軸部が隣接する部分に配置される第二の封止部材であってもよい。   The sealing member may be a second sealing member disposed at a portion where the first conductive member and the shaft portion are adjacent to each other.

前記固定部は、前記軸部の軸方向で前記第一の導電部材よりも突出してもよい。   The fixing portion may protrude from the first conductive member in the axial direction of the shaft portion.

前記固定部は、前記軸部の軸方向で前記第一の導電部材よりも窪んで位置してもよい。   The fixing portion may be positioned so as to be recessed from the first conductive member in the axial direction of the shaft portion.

前記封止部材の硬度は、前記第一の導電部材の硬度及び前記第二の導電部材の硬度よりも低くてもよい。   The sealing member may have a hardness lower than the hardness of the first conductive member and the hardness of the second conductive member.

前記封止部材は、前記第一の導電部材及び前記第二の導電部材の少なくとも一方に向かって突出する凸部を含んでもよい。   The sealing member may include a convex portion protruding toward at least one of the first conductive member and the second conductive member.

前記第一の導電部材及び前記第二の導電部材の少なくとも一方は、前記封止部材に向かって突出する凸部を含んでもよい。   At least one of the first conductive member and the second conductive member may include a convex portion protruding toward the sealing member.

本発明に係る蓄電素子によれば、異種金属間の腐食を抑制する構成のコスト低減が可能になる。   According to the electricity storage device of the present invention, it is possible to reduce the cost of a configuration that suppresses corrosion between different metals.

図１は、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。FIG. 1 is a perspective view schematically showing the external appearance of the energy storage device according to the embodiment. 図２は、図１の蓄電素子の部分的な分解斜視図である。FIG. 2 is a partially exploded perspective view of the electricity storage device of FIG. 図３は、図２の正極端子及び負極端子並びにこれらの周辺の構成要素の分解斜視図である。FIG. 3 is an exploded perspective view of the positive electrode terminal and the negative electrode terminal of FIG. 2 and components around them. 図４は、図３の負極端子及びその周辺の構成要素を、図３と同様の方向から拡大して見た分解斜視図である。FIG. 4 is an exploded perspective view of the negative electrode terminal of FIG. 3 and its surrounding components enlarged from the same direction as in FIG. 図５Ａは、図１の蓄電素子の正極端子及び負極端子を縦断する断面図を、方向Ｖで見た断面側面図であり、負極端子及びその周辺の構成を示す図である。5A is a cross-sectional side view of a cross-sectional view of the positive electrode terminal and the negative electrode terminal of the energy storage device of FIG. 1 as viewed in the direction V, and is a diagram illustrating a configuration of the negative electrode terminal and its periphery. 図５Ｂは、図５Ａを拡大した断面側面図であり、封止部材を取り除いたケースを示す図である。FIG. 5B is an enlarged cross-sectional side view of FIG. 5A and shows a case where the sealing member is removed. 図６は、変形例１に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 6 is a cross-sectional side view showing the configuration of the negative electrode terminal and its periphery of the electricity storage device according to Modification 1 in the same manner as FIG. 5A. 図７は、変形例２に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 7 is a cross-sectional side view showing the configuration of the negative electrode terminal and its periphery of the electricity storage device according to Modification 2 in the same manner as FIG. 5A. 図８は、変形例３に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 8 is a cross-sectional side view showing the configuration of the negative electrode terminal and its periphery of the electricity storage device according to Modification 3 as in FIG. 5A. 図９は、変形例３の別の一態様に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 9 is a cross-sectional side view showing the configuration of the negative electrode terminal and its periphery of the energy storage device according to another aspect of Modification 3 in the same manner as FIG. 5A. 図１０は、変形例４に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 10 is a cross-sectional side view showing the configuration of the negative electrode terminal of the electricity storage device according to Modification 4 and the periphery thereof in the same manner as FIG. 5A. 図１１は、変形例４の別の一態様に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 11 is a cross-sectional side view showing the configuration of the negative electrode terminal and its surroundings of a power storage device according to another aspect of Modification 4 in the same manner as FIG. 5A. 図１２は、変形例４の別の一態様に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 12 is a cross-sectional side view showing the configuration of the negative electrode terminal and its surroundings of a power storage device according to another aspect of Modification 4 in the same manner as FIG. 5A. 図１３は、変形例４の別の一態様に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。FIG. 13 is a cross-sectional side view showing the configuration of the negative electrode terminal of the electricity storage device according to another aspect of Modification 4 and the periphery thereof, as in FIG. 5A. 図１４は、変形例５に係る蓄電素子の負極端子及び封止部材の構成を、図５Ａと同様の断面に示す断面側面図である。FIG. 14 is a cross-sectional side view showing the configurations of the negative electrode terminal and the sealing member of the energy storage device according to Modification 5 in the same cross section as FIG. 5A. 図１５は、変形例６に係る蓄電素子の負極端子及び封止部材の構成を、図１０と同様に示す断面側面図である。FIG. 15 is a cross-sectional side view showing the configuration of the negative electrode terminal and the sealing member of the electricity storage device according to Modification 6 as in FIG.

以下において、図面を参照しつつ、本発明の実施の形態及び変形例に係る蓄電素子を説明する。なお、以下で説明する実施の形態及び変形例は、いずれも本発明の好ましい一具体例を示すものである。以下の実施の形態及び変形例で示される数値、形状、材料、構成要素、並びに構成要素の配置位置及び接続形態等は、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。   Hereinafter, an electricity storage device according to embodiments and modifications of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments and modifications described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, and the like shown in the following embodiments and modifications are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments and modifications, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

また、添付の図面における各図は、模式的な図であり、必ずしも厳密に図示されたものでない。さらに、各図において、同一又は同様な構成要素については同じ符号を付している。また、以下の実施の形態の説明において、略平行、略直交のような「略」を伴った表現が、用いられる場合がある。例えば、略平行とは、完全に平行であることを意味するだけでなく、実質的に平行である、すなわち、例えば数％程度の差異を含むことも意味する。他の「略」を伴った表現についても同様である。   Each figure in the accompanying drawings is a schematic diagram and is not necessarily illustrated strictly. Furthermore, in each figure, the same code | symbol is attached | subjected about the same or similar component. In the following description of the embodiments, expressions with “substantially” such as substantially parallel and substantially orthogonal may be used. For example, “substantially parallel” not only means completely parallel, but also means substantially parallel, that is, including a difference of, for example, several percent. The same applies to expressions involving other “abbreviations”.

［実施の形態］
実施の形態に係る蓄電素子１００の構成を説明する。図１は、実施の形態に係る蓄電素子１００の外観を模式的に示す斜視図である。図１に示されるように、蓄電素子１００は、扁平な直方体状の外形を有している。蓄電素子１００は、充放電可能な二次電池である。例えば、蓄電素子１００は、リチウムイオン二次電池等の非水電解質二次電池である。しかしながら、蓄電素子１００は、非水電解質二次電池に限定されず、非水電解質二次電池以外の二次電池であってもよく、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く、キャパシタであってもよい。 [Embodiment]
The structure of the electrical storage element 100 which concerns on embodiment is demonstrated. FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 100 according to the embodiment. As shown in FIG. 1, the power storage element 100 has a flat rectangular parallelepiped outer shape. The storage element 100 is a chargeable / dischargeable secondary battery. For example, the electricity storage device 100 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. However, the storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, and can store the stored electricity without being charged by the user. A usable primary battery or a capacitor may be used.

図２は、図１の蓄電素子１００の部分的な分解斜視図である。図１及び図２を参照すると、蓄電素子１００は、扁平な直方体状の容器１０と、容器１０の中に収容される電極体２０と、電極端子である正極端子３１及び負極端子４１とを備えている。正極端子３１及び負極端子４１は、容器１０の外部空間に露出して設けられている。ここで、負極端子４１は、第一の導電部材の一例である。   FIG. 2 is a partially exploded perspective view of the electricity storage device 100 of FIG. Referring to FIGS. 1 and 2, the storage element 100 includes a flat rectangular parallelepiped container 10, an electrode body 20 accommodated in the container 10, and a positive electrode terminal 31 and a negative electrode terminal 41 that are electrode terminals. ing. The positive electrode terminal 31 and the negative electrode terminal 41 are provided exposed in the external space of the container 10. Here, the negative electrode terminal 41 is an example of a first conductive member.

容器１０は、有底角筒状の容器本体１１と、容器本体１１の細長い矩形形状の開口部１１ａを閉鎖可能である細長い矩形板状の蓋体１２とを有している。容器本体１１と蓋体１２とは、溶接等の接合方法によって、互いに固定される。限定するものではないが、容器本体１１及び蓋体１２は、例えばステンレス鋼、アルミニウム、アルミニウム合金等の溶接可能な金属から作製され得る。ここで、蓋体１２は、容器の壁部の一例である。   The container 10 has a bottomed rectangular tube-shaped container body 11 and an elongated rectangular plate-like lid body 12 that can close the elongated rectangular opening 11 a of the container body 11. The container body 11 and the lid body 12 are fixed to each other by a joining method such as welding. Although it does not limit, the container main body 11 and the cover body 12 may be produced from weldable metals, such as stainless steel, aluminum, aluminum alloy, for example. Here, the lid body 12 is an example of a wall portion of the container.

蓋体１２は、互いに対向する矩形状の外面１２ａ及び内面１２ｂを有する。蓋体１２が形成する矩形の長手方向に沿い且つ外面１２ａ及び内面１２ｂに沿う方向を、Ｘ軸方向と定義する。蓋体１２の長手方向に垂直であり且つ外面１２ａ及び内面１２ｂに沿う方向を、Ｙ軸方向と定義する。外面１２ａ及び内面１２ｂに垂直な方向を、Ｚ軸方向と定義する。Ｘ軸方向、Ｙ軸方向及びＺ軸方向は、互いに直交する。   The lid 12 has a rectangular outer surface 12a and an inner surface 12b facing each other. A direction along the longitudinal direction of the rectangle formed by the lid 12 and along the outer surface 12a and the inner surface 12b is defined as an X-axis direction. A direction perpendicular to the longitudinal direction of the lid 12 and along the outer surface 12a and the inner surface 12b is defined as a Y-axis direction. A direction perpendicular to the outer surface 12a and the inner surface 12b is defined as a Z-axis direction. The X axis direction, the Y axis direction, and the Z axis direction are orthogonal to each other.

容器１０の内部には、電極体２０と共に電解液（本実施の形態では、非水電解液）等の電解質が封入されるが、当該電解質の図示は省略する。容器１０に封入される電解質としては、蓄電素子１００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。   An electrolyte such as an electrolytic solution (in this embodiment, a nonaqueous electrolytic solution) is enclosed inside the container 10 together with the electrode body 20, but the illustration of the electrolyte is omitted. As the electrolyte sealed in the container 10, there is no particular limitation on the type thereof as long as it does not impair the performance of the electricity storage device 100, and various types can be selected.

蓋体１２の外面１２ａ上に、導電性を有する正極端子３１及び負極端子４１が配置される。正極端子３１は、蓋体１２のＸ軸方向の２つの端部の一方の近傍に配置され、負極端子４１は、蓋体１２のＸ軸方向の２つの端部の他方の近傍に配置される。正極端子３１及び負極端子４１はそれぞれ、蓋体１２を挟んで反対側に配置され且つ導電性を有する正極集電部材３４及び負極集電部材４４と物理的及び電気的に接続される。正極集電部材３４及び負極集電部材４４はさらに、電極体２０と物理的及び電気的に接続される。正極集電部材３４及び負極集電部材４４は、電極体２０と共に、容器本体１１に収容される。ここで、負極集電部材４４は、第二の導電部材の一例である。   On the outer surface 12a of the lid body 12, a positive electrode terminal 31 and a negative electrode terminal 41 having conductivity are disposed. The positive electrode terminal 31 is disposed in the vicinity of one of the two end portions of the lid body 12 in the X-axis direction, and the negative electrode terminal 41 is disposed in the vicinity of the other of the two end portions of the lid body 12 in the X-axis direction. . The positive electrode terminal 31 and the negative electrode terminal 41 are physically and electrically connected to the positive electrode current collector 34 and the negative electrode current collector 44 that are disposed on the opposite sides of the lid 12 and have conductivity. The positive electrode current collecting member 34 and the negative electrode current collecting member 44 are further physically and electrically connected to the electrode body 20. The positive electrode current collecting member 34 and the negative electrode current collecting member 44 are accommodated in the container body 11 together with the electrode body 20. Here, the negative electrode current collecting member 44 is an example of a second conductive member.

電極体２０は、電気を蓄積可能な蓄電要素（発電要素とも呼ばれる）である。電極体２０は、シート状の正極板（図示せず）と、シート状の負極板（図示せず）と、シート状のセパレータ（図示せず）とが、巻回軸Ａを中心に一緒に渦巻き状に巻回されることによって、形成される。これにより、正極板及び負極板が、これらの間にセパレータを介在させつつ、巻回軸Ａの周りに多重に積層される。巻回軸Ａは、図２において一点鎖線で示される仮想の軸であり、電極体２０は、巻回軸Ａに関して略対称な構成を有する。限定されるものではないが、本実施の形態では、電極体２０は、巻回軸Ａに垂直な断面が長円形状である扁平な外形を有している。このような電極体２０は、巻回軸Ａの周りに、２つの湾曲部分と湾曲部分の間の平坦部分とを含む。しかしながら、電極体２０の断面形状は、長円形以外であってもよく、円形、楕円形、矩形、又はその他の多角形等であってもよい。   The electrode body 20 is a power storage element (also called a power generation element) that can store electricity. The electrode body 20 includes a sheet-like positive electrode plate (not shown), a sheet-like negative electrode plate (not shown), and a sheet-like separator (not shown) together around a winding axis A. It is formed by being wound in a spiral. As a result, the positive electrode plate and the negative electrode plate are stacked in multiple layers around the winding axis A with the separator interposed therebetween. The winding axis A is a virtual axis indicated by a one-dot chain line in FIG. 2, and the electrode body 20 has a substantially symmetric configuration with respect to the winding axis A. Although not limited, in this Embodiment, the electrode body 20 has a flat external shape whose cross section perpendicular | vertical to the winding axis A is an ellipse shape. Such an electrode body 20 includes two curved portions and a flat portion between the curved portions around the winding axis A. However, the cross-sectional shape of the electrode body 20 may be other than an oval shape, and may be a circle, an ellipse, a rectangle, or another polygon.

正極板は、アルミニウム、アルミニウム合金等の金属からなる帯状の金属箔である正極基材（図示せず）と、正極基材上に形成された正極活物質層（図示せず）とを含む。負極板は、銅、銅合金等の金属からなる帯状の金属箔である負極基材（図示せず）と、負極基材上に形成された負極活物質層（図示せず）とを含む。正極活物質層及び負極活物質層それぞれに用いられる正極活物質及び負極活物質には、リチウムイオンを吸蔵放出可能な正極活物質及び負極活物質であれば、適宜公知の材料を使用できる。セパレータは、樹脂等の電気的な絶縁性を有する材料からなるシートであり、例えば微多孔性のシートである。   A positive electrode plate contains the positive electrode base material (not shown) which is a strip | belt-shaped metal foil which consists of metals, such as aluminum and an aluminum alloy, and the positive electrode active material layer (not shown) formed on the positive electrode base material. A negative electrode plate contains the negative electrode base material (not shown) which is a strip | belt-shaped metal foil consisting of metals, such as copper and a copper alloy, and the negative electrode active material layer (not shown) formed on the negative electrode base material. As the positive electrode active material and the negative electrode active material used in each of the positive electrode active material layer and the negative electrode active material layer, known materials can be appropriately used as long as they are positive electrode active materials and negative electrode active materials capable of occluding and releasing lithium ions. The separator is a sheet made of an electrically insulating material such as a resin, for example, a microporous sheet.

電極体２０の巻回軸Ａ方向の一方の端部の正極板が、正極集電部材３４と接続され、他方の端部の負極板が、負極集電部材４４と接続される。このとき、電極体２０は、巻回軸Ａを蓋体１２の長手方向であるＸ軸方向に沿う向きにし、且つ湾曲部分の一方を蓋体１２と対向させるように、蓋体１２に対して配置される。   The positive electrode plate at one end in the winding axis A direction of the electrode body 20 is connected to the positive electrode current collector 34, and the negative electrode plate at the other end is connected to the negative electrode current collector 44. At this time, the electrode body 20 faces the lid body 12 so that the winding axis A is oriented along the X-axis direction which is the longitudinal direction of the lid body 12 and one of the curved portions is opposed to the lid body 12. Be placed.

図３及び図４を参照して、正極端子３１及び負極端子４１並びにこれらの周辺の構成を説明する。図３は、図２の正極端子３１及び負極端子４１並びにこれらの周辺の構成要素の分解斜視図である。図４は、図３の負極端子４１及びその周辺の構成要素を、図３と同様の方向から拡大して見た分解斜視図である。正極端子３１及び負極端子４１はそれぞれ、導電性を有する材料で構成され、後述する封止部材４５が負極端子４１に配置されることを除けば、同様の構成を有している。このため、以降では、負極端子４１に関連する構成の詳細な説明をし、正極端子３１に関連する構成の詳細な説明を省略する。   With reference to FIG.3 and FIG.4, the structure of the positive electrode terminal 31, the negative electrode terminal 41, and these periphery is demonstrated. FIG. 3 is an exploded perspective view of the positive electrode terminal 31 and the negative electrode terminal 41 of FIG. 2 and their peripheral components. 4 is an exploded perspective view of the negative electrode terminal 41 and its peripheral components in FIG. 3 as viewed from the same direction as in FIG. The positive electrode terminal 31 and the negative electrode terminal 41 are each made of a conductive material, and have the same configuration except that a sealing member 45 described later is disposed on the negative electrode terminal 41. Therefore, hereinafter, a detailed description of the configuration related to the negative electrode terminal 41 will be given, and a detailed description of the configuration related to the positive electrode terminal 31 will be omitted.

正極端子３１及び負極端子４１は、矩形板状の形状を有している。限定されるものではないが、本実施の形態では、正極端子３１及び負極端子４１は、電極体２０の正極基材と同様の金属材料で構成されている。なお、正極端子３１及び負極端子４１は、上記金属以外の材料で構成されてもよく、互いに異なる材料で構成されてもよい。   The positive electrode terminal 31 and the negative electrode terminal 41 have a rectangular plate shape. Although not limited, in this Embodiment, the positive electrode terminal 31 and the negative electrode terminal 41 are comprised with the metal material similar to the positive electrode base material of the electrode body 20. FIG. In addition, the positive electrode terminal 31 and the negative electrode terminal 41 may be comprised with materials other than the said metal, and may be comprised with a mutually different material.

上部絶縁部材３２及び４２、並びに、下部絶縁部材３３及び４３が、正極及び負極の電極端子３１及び４１と蓋体１２との電気的な絶縁、並びに、蓋体１２と正極及び負極の集電部材３４及び４４との電気的な絶縁のために設けられる。上部絶縁部材３２及び４２、並びに下部絶縁部材３３及び４３は、矩形板状の形状を有し、樹脂等の電気的な絶縁性を有する材料で構成され、例えば、ガスケットである。上部絶縁部材３２及び４２、並びに下部絶縁部材３３及び４３の構成材は、電気的な絶縁性を有すれば、樹脂のような有機絶縁材料でなく、雲母、セラミック、ガラス等の無機絶縁材料であってもよい。   The upper insulating members 32 and 42 and the lower insulating members 33 and 43 are electrically insulated from the positive and negative electrode terminals 31 and 41 and the lid 12, and the current collectors of the lid 12 and the positive and negative electrodes Provided for electrical isolation from 34 and 44. The upper insulating members 32 and 42 and the lower insulating members 33 and 43 have a rectangular plate shape and are made of an electrically insulating material such as resin, and are, for example, gaskets. The constituent material of the upper insulating members 32 and 42 and the lower insulating members 33 and 43 is not an organic insulating material such as resin, but an inorganic insulating material such as mica, ceramic, glass, etc., as long as it has electrical insulation. There may be.

正極集電部材３４及び負極集電部材４４はそれぞれ、限定されるものではないが、本実施の形態では、電極体２０の正極基材及び負極基材と同様の金属材料で構成されている。正極集電部材３４及び負極集電部材４４の少なくとも一方が、これらが接続される正極端子３１及び負極端子４１と異なる金属材料で構成される。本実施の形態では、負極集電部材４４のみが、負極端子４１と異なる金属材料で構成され、正極集電部材３４は正極端子３１と同一の金属材料で構成されるとして説明するが、これに限定されない。   The positive electrode current collecting member 34 and the negative electrode current collecting member 44 are not limited, but in the present embodiment, the positive electrode current collecting member 34 and the negative electrode current collecting member 44 are made of the same metal material as the positive electrode base material and the negative electrode base material of the electrode body 20. At least one of the positive electrode current collecting member 34 and the negative electrode current collecting member 44 is made of a metal material different from the positive electrode terminal 31 and the negative electrode terminal 41 to which they are connected. In the present embodiment, it is assumed that only the negative electrode current collecting member 44 is made of a metal material different from that of the negative electrode terminal 41, and the positive electrode current collecting member 34 is made of the same metal material as that of the positive electrode terminal 31, It is not limited.

正極集電部材３４及び負極集電部材４４はそれぞれ、１つの矩形板状のベース３４ａ及び４４ａと、ベース３４ａ及び４４ａからこれと略垂直な方向に延びる２つの脚部３４ｂ及び４４ｂと、ベース３４ａ及び４４ａからこれと略垂直な方向に延びる円筒状の軸部３４ｃ及び４４ｃとを有している。脚部３４ｂ及び４４ｂと軸部３４ｃ及び４４ｃは、互いに反対方向に延びる。ベースと脚部と軸部とは、一体成形等により全てが一体的に形成されてもよく、これらの少なくとも１つが別個の部材であってもよい。脚部３４ｂ及び４４ｂが、電極体２０と接続される。   The positive electrode current collecting member 34 and the negative electrode current collecting member 44 are respectively composed of one rectangular plate-like bases 34a and 44a, two legs 34b and 44b extending from the bases 34a and 44a in a direction substantially perpendicular thereto, and a base 34a. And 44a have cylindrical shaft portions 34c and 44c extending in a direction substantially perpendicular thereto. The leg portions 34b and 44b and the shaft portions 34c and 44c extend in directions opposite to each other. The base, the leg portion, and the shaft portion may all be integrally formed by integral molding or the like, and at least one of them may be a separate member. Leg portions 34 b and 44 b are connected to electrode body 20.

正極端子３１、上部絶縁部材３２、蓋体１２、下部絶縁部材３３及び正極集電部材３４のベース３４ａが、この順で重ねて配置される。正極集電部材３４の軸部３４ｃは、下部絶縁部材３３、蓋体１２、上部絶縁部材３２及び正極端子３１を順次貫通し、正極端子３１と接合される。負極端子４１、上部絶縁部材４２、蓋体１２、下部絶縁部材４３及び負極集電部材４４のベース４４ａが、この順で重ねて配置される。負極集電部材４４の軸部４４ｃは、下部絶縁部材４３、蓋体１２、上部絶縁部材４２及び負極端子４１を順次貫通し、負極端子４１と接合される。この結果、正極端子３１、上部絶縁部材３２、下部絶縁部材３３及び正極集電部材３４が蓋体１２に固定され、負極端子４１、上部絶縁部材４２、下部絶縁部材４３及び負極集電部材４４が蓋体１２に固定される。さらに、正極端子３１及び正極集電部材３４が互いに物理的及び電気的に接続され、負極端子４１及び負極集電部材４４が互いに物理的及び電気的に接続される。   The positive terminal 31, the upper insulating member 32, the lid body 12, the lower insulating member 33, and the base 34 a of the positive current collecting member 34 are arranged in this order. The shaft portion 34 c of the positive electrode current collecting member 34 sequentially penetrates the lower insulating member 33, the lid body 12, the upper insulating member 32, and the positive electrode terminal 31, and is joined to the positive electrode terminal 31. The negative electrode terminal 41, the upper insulating member 42, the lid body 12, the lower insulating member 43, and the base 44 a of the negative electrode current collecting member 44 are arranged in this order. The shaft portion 44 c of the negative electrode current collecting member 44 passes through the lower insulating member 43, the lid body 12, the upper insulating member 42 and the negative electrode terminal 41 in order, and is joined to the negative electrode terminal 41. As a result, the positive terminal 31, the upper insulating member 32, the lower insulating member 33, and the positive current collecting member 34 are fixed to the lid body 12, and the negative terminal 41, the upper insulating member 42, the lower insulating member 43, and the negative current collecting member 44 are It is fixed to the lid 12. Further, the positive terminal 31 and the positive current collecting member 34 are physically and electrically connected to each other, and the negative terminal 41 and the negative current collecting member 44 are physically and electrically connected to each other.

本実施の形態では、軸部３４ｃ及び４４ｃはそれぞれ、かしめ接合によって、正極端子３１及び負極端子４１と接合される。かしめ接合では、正極端子３１及び負極端子４１それぞれから突出する軸部３４ｃ及び４４ｃの先端部分が、蓋体１２に向かう押圧力を受け、それにより、径方向外側に円形状に拡がるように塑性変形し、かしめ突出部を形成する。かしめ突出部は、正極端子３１及び負極端子４１を保持し、蓋体１２に固定する。かしめ突出部は、例えば、回転する治具により軸部３４ｃ及び４４ｃの先端部分を加圧し径方向外側に変形させる、スピンかしめ法により形成することができる。また、軸部３４ｃ及び４４ｃの先端部分を加圧して潰すプレスかしめ法によって、かしめ突出部が形成されてもよい。なお、軸部３４ｃ及び４４ｃは、中実の円柱であってもよい。軸部３４ｃ及び４４ｃと正極端子３１及び負極端子４１とは、かしめ以外の接合方法で接続されてもよい。例えば、ねじを用いたねじ締結による接合等が、用いられてもよい。   In the present embodiment, the shaft portions 34c and 44c are joined to the positive terminal 31 and the negative terminal 41 by caulking, respectively. In the caulking joining, the tip portions of the shaft portions 34c and 44c protruding from the positive electrode terminal 31 and the negative electrode terminal 41 receive a pressing force toward the lid body 12, thereby plastically deforming so as to expand radially outward. And caulking protrusions are formed. The caulking protrusion holds the positive electrode terminal 31 and the negative electrode terminal 41 and is fixed to the lid body 12. The caulking protrusion can be formed, for example, by a spin caulking method in which the tip portions of the shaft portions 34c and 44c are pressed by a rotating jig and deformed radially outward. Further, the caulking protrusions may be formed by a press caulking method in which the tip portions of the shaft portions 34c and 44c are pressed and crushed. The shaft portions 34c and 44c may be solid cylinders. The shaft portions 34c and 44c and the positive electrode terminal 31 and the negative electrode terminal 41 may be connected by a bonding method other than caulking. For example, joining by screw fastening using a screw may be used.

詳細は後述するが、軸部４４ｃが通る負極端子４１の貫通孔は、その軸方向の途中で段差状に拡径している。具体的には、貫通孔における上部絶縁部材４２と隣接する小径部分の径よりも、貫通孔における上部絶縁部材４２と反対側の大径部分の径の方が大きい。負極端子４１の大径部分には、環状の封止部材４５が配置される。封止部材４５は、負極端子４１の小径部分の周囲を囲む形状及び寸法を有し、軸部４４ｃのかしめ突出部と負極端子４１との間で挟まれる。   As will be described in detail later, the through hole of the negative electrode terminal 41 through which the shaft portion 44c passes is enlarged in a step shape in the middle of the axial direction. Specifically, the diameter of the large-diameter portion opposite to the upper insulating member 42 in the through hole is larger than the diameter of the small-diameter portion adjacent to the upper insulating member 42 in the through hole. An annular sealing member 45 is disposed on the large diameter portion of the negative electrode terminal 41. The sealing member 45 has a shape and dimensions surrounding the periphery of the small diameter portion of the negative electrode terminal 41, and is sandwiched between the caulking protrusion of the shaft portion 44 c and the negative electrode terminal 41.

封止部材４５は、軸部４４ｃのかしめ突出部と負極端子４１との間に、外部から液体が侵入することを防ぐ液密性を有する部材である。本実施の形態では、軸部４４ｃのかしめ突出部と負極端子４１とは、互いにイオン化傾向が異なる金属材料で構成されている。軸部４４ｃのかしめ突出部と負極端子４１とが液体（水分等）を介して導通すると、ガルバニック腐食が発生する可能性がある。封止部材４５は、ガルバニック腐食の発生を抑制する。なお、同一の金属材料で構成される正極集電部材３４の軸部３４ｃのかしめ突出部と正極端子３１との間には、封止部材が設けられても設けられなくてもよい。   The sealing member 45 is a member having liquid tightness that prevents liquid from entering from the outside between the caulking protrusion of the shaft portion 44 c and the negative electrode terminal 41. In the present embodiment, the caulking protrusion of the shaft portion 44c and the negative terminal 41 are made of metal materials having different ionization tendencies. If the caulking protrusion of the shaft portion 44c and the negative electrode terminal 41 are conducted through a liquid (moisture or the like), galvanic corrosion may occur. The sealing member 45 suppresses the occurrence of galvanic corrosion. Note that a sealing member may or may not be provided between the caulking protrusion of the shaft portion 34 c of the positive electrode current collector 34 made of the same metal material and the positive electrode terminal 31.

本実施の形態では、封止部材４５は、非金属材料で構成される。さらに、封止部材４５は、封止対象である軸部４４ｃ及び負極端子４１よりも低い硬度を有することが望ましい。このとき、封止部材４５は、封止対象の２つの構成要素によって挟まれ押圧されることによって、構成要素の接触面の形状に対応して変形し、これら構成要素の間を効果的に封止する。なお、硬度は、ビッカース硬度、ブリネル硬度、ロックウェル硬度等の硬度の指標を用いて判別することができる。ビッカース硬度、ブリネル硬度、ロックウェル硬度はいずれも、計測対象物の表面近傍における押し込み硬さを示す。   In the present embodiment, the sealing member 45 is made of a nonmetallic material. Furthermore, the sealing member 45 desirably has a hardness lower than that of the shaft portion 44 c and the negative electrode terminal 41 to be sealed. At this time, the sealing member 45 is deformed corresponding to the shape of the contact surface of the constituent elements by being sandwiched and pressed between the two constituent elements to be sealed, and effectively seals between the constituent elements. Stop. The hardness can be determined using an index of hardness such as Vickers hardness, Brinell hardness, Rockwell hardness or the like. Vickers hardness, Brinell hardness, and Rockwell hardness all indicate indentation hardness in the vicinity of the surface of the measurement object.

上述のような封止部材４５は、軸部４４ｃ及び負極端子４１よりも低い硬度を有する樹脂等の電気的な絶縁性を有する材料で構成されてもよい。封止部材４５を構成する樹脂として、例えば、ＰＰＳ（ポリフェニレンサルファド）、ＰＥＥＫ（ポリエーテルエーテルケトン）、ＰＰ（ポリプロピレン）、ＰＦＡ（テトラフルオロエチレン−パーフルオロアルキルビニルエーテル共重合体）等が用いられてもよい。また、封止部材４５は、粒子状、繊維状、板状等のフィラーを含んだ樹脂で構成されてもよい。フィラーの構成物質には、炭素、金属酸化物等の既知の種々の物質が用いられてよい。なお、軸部４４ｃのかしめ突出部と負極端子４１とに直接接触する封止部材４５は、これらの間の電気的な接続を遮断するために、電気的な絶縁性を有する材料で構成されることが好ましい。   The sealing member 45 as described above may be made of an electrically insulating material such as a resin having a hardness lower than that of the shaft portion 44 c and the negative electrode terminal 41. As the resin constituting the sealing member 45, for example, PPS (polyphenylene sulfide), PEEK (polyether ether ketone), PP (polypropylene), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) and the like are used. May be. Moreover, the sealing member 45 may be comprised with resin containing fillers, such as particulate form, fibrous form, and plate shape. As the constituent material of the filler, various known materials such as carbon and metal oxides may be used. The sealing member 45 that is in direct contact with the caulking protrusion of the shaft portion 44c and the negative electrode terminal 41 is made of an electrically insulating material in order to cut off the electrical connection between them. It is preferable.

図４及び図５Ａを参照して、負極端子４１及び封止部材４５並びにこれらの周辺の構成の詳細を説明する。図５Ａは、図１の蓄電素子１００の正極端子３１及び負極端子４１を縦断し且つＸＺ平面に沿う断面図を、Ｙ軸方向の方向Ｖで見た断面側面図であり、負極端子４１及びその周辺の構成を示す図である。   With reference to FIG.4 and FIG.5A, the negative electrode terminal 41, the sealing member 45, and the detail of the structure of these periphery are demonstrated. 5A is a cross-sectional side view of the positive electrode terminal 31 and the negative electrode terminal 41 of the electricity storage device 100 of FIG. 1 taken along the XZ plane and viewed in the direction V in the Y-axis direction. It is a figure which shows the periphery structure.

負極端子４１には、貫通孔４１ａが形成されている。貫通孔４１ａは、その軸方向の途中で拡径し、小径部４１ａａと、小径部４１ａａよりも大きい内径を有する大径部４１ａｂとを含む。大径部４１ａｂは、負極端子４１における上部絶縁部材４２と反対側の表面４１ｃで開口し、小径部４１ａａは、表面４１ｃと反対側であり且つ上部絶縁部材４２に隣接する表面４１ｄで開口する。小径部４１ａａは、負極集電部材４４の軸部４４ｃの外径と同等の内径を有する。大径部４１ａｂと小径部４１ａａとの環状の段差部４１ａｃ上には、小径部４１ａａの開口の周囲を囲む環状の溝４１ｂが形成されている。溝４１ｂは、矩形状の断面形状を有し、大径部４１ａｂの内周面に隣接して位置する。   A through hole 41 a is formed in the negative terminal 41. The through hole 41a includes a small diameter portion 41aa and a large diameter portion 41ab having an inner diameter larger than that of the small diameter portion 41aa. The large-diameter portion 41ab opens at the surface 41c opposite to the upper insulating member 42 in the negative electrode terminal 41, and the small-diameter portion 41aa opens at the surface 41d opposite to the surface 41c and adjacent to the upper insulating member 42. The small diameter portion 41aa has an inner diameter equivalent to the outer diameter of the shaft portion 44c of the negative electrode current collecting member 44. An annular groove 41b surrounding the opening of the small diameter portion 41aa is formed on the annular step portion 41ac between the large diameter portion 41ab and the small diameter portion 41aa. The groove 41b has a rectangular cross-sectional shape and is positioned adjacent to the inner peripheral surface of the large-diameter portion 41ab.

溝４１ｂ内には、環状の封止部材４５が配置される。封止部材４５は、径方向において、Ｌ字状の断面形状を有している。封止部材４５は、円筒状の側壁部４５ｂと、側壁部４５ｂの縁に沿い且つ当該縁から径方向内側に延びる円環板状の底壁部４５ａとを一体的に含む。底壁部４５ａが、溝４１ｂのＺ軸方向の底面と当接し、側壁部４５ｂが、大径部４１ａｂの内周面に当接する。これにより、封止部材４５は、溝４１ｂ内に嵌り位置決めされる。底壁部４５ａは、溝４１ｂのＺ軸方向の深さより大きい厚さを有し、段差部４１ａｃよりも突出する。封止部材４５は、段差部４１ａｃと大径部４１ａｂとの隅角部に配置されている。   An annular sealing member 45 is disposed in the groove 41b. The sealing member 45 has an L-shaped cross-sectional shape in the radial direction. The sealing member 45 integrally includes a cylindrical side wall portion 45b and an annular plate-shaped bottom wall portion 45a extending along the edge of the side wall portion 45b and radially inward from the edge. The bottom wall portion 45a contacts the bottom surface in the Z-axis direction of the groove 41b, and the side wall portion 45b contacts the inner peripheral surface of the large diameter portion 41ab. Thereby, the sealing member 45 is fitted and positioned in the groove 41b. The bottom wall portion 45a has a thickness larger than the depth of the groove 41b in the Z-axis direction, and protrudes from the step portion 41ac. The sealing member 45 is disposed at the corner between the step portion 41ac and the large diameter portion 41ab.

下部絶縁部材４３は、Ｚ軸方向に突出して延びる筒部４３ａを一体的に含む。下部絶縁部材４３では、貫通孔４３ｂが、筒部４３ａを通って下部絶縁部材４３を貫通して形成されている。下部絶縁部材４３は、筒部４３ａを、蓋体１２に形成された貫通孔１２ｃ及び上部絶縁部材４２に形成された貫通孔４２ａに通して、蓋体１２及び上部絶縁部材４２に組み付けられる。筒部４３ａの先端は、負極端子４１の表面４１ｄ上で小径部４１ａａの周囲を囲むように形成された環状溝に、嵌合する。これにより、筒部４３ａは、負極端子４１の表面４１ｄと上部絶縁部材４２との間から小径部４１ａａ内への液体の侵入を抑制する。   The lower insulating member 43 integrally includes a cylindrical portion 43a that protrudes and extends in the Z-axis direction. In the lower insulating member 43, a through hole 43b is formed to penetrate the lower insulating member 43 through the cylindrical portion 43a. The lower insulating member 43 is assembled to the lid body 12 and the upper insulating member 42 through the cylindrical portion 43 a through the through hole 12 c formed in the lid body 12 and the through hole 42 a formed in the upper insulating member 42. The tip of the cylinder portion 43a is fitted in an annular groove formed on the surface 41d of the negative electrode terminal 41 so as to surround the small diameter portion 41aa. Thereby, the cylinder part 43a suppresses the penetration | invasion of the liquid into the small diameter part 41aa from between the surface 41d of the negative electrode terminal 41, and the upper insulating member 42. FIG.

負極集電部材４４の軸部４４ｃは、下部絶縁部材４３の筒部４３ａの貫通孔４３ｂ及び負極端子４１の貫通孔４１ａに順次通され、貫通孔４１ａの大径部４１ａｂに突出する軸部４４ｃの先端部分で、接合のためのかしめ加工を受ける。かしめ加工では、Ｚ軸方向の押圧力が軸部４４ｃの先端部分に与えられる。これにより、当該先端部分が、大径部４１ａｂの径方向に拡径するように塑性変形し、かしめ突出部４４ｃａを形成する。形成されたかしめ突出部４４ｃａは、段差部４１ａｃ上で円形状に広がって延在し、封止部材４５上にまで至る。かしめ突出部４４ｃａは、底壁部４５ａを溝４１ｂの底部、つまり負極端子４１に押し付ける。さらに、かしめ突出部４４ｃａは、拡径することによって、封止部材４５の側壁部４５ｂに当接し、側壁部４５ｂを大径部４１ａｂの内周面に押し付ける。また、かしめ突出部４４ｃａは、封止部材４５の内側において、段差部４１ａｃ、つまり負極端子４１と直接接触する。ここで、かしめ突出部４４ｃａは、固定部及び塑性変形部の一例である。   The shaft portion 44c of the negative electrode current collecting member 44 is sequentially passed through the through hole 43b of the cylindrical portion 43a of the lower insulating member 43 and the through hole 41a of the negative electrode terminal 41, and protrudes into the large diameter portion 41ab of the through hole 41a. The tip part of the wire is caulked for joining. In the caulking process, a pressing force in the Z-axis direction is applied to the tip portion of the shaft portion 44c. Thereby, the said front-end | tip part deforms plastically so that it may expand in the radial direction of the large diameter part 41ab, and the crimping protrusion part 44ca is formed. The formed caulking protrusion 44ca extends in a circular shape on the step portion 41ac and reaches the sealing member 45. The caulking protrusion 44 ca presses the bottom wall 45 a against the bottom of the groove 41 b, that is, the negative terminal 41. Furthermore, the caulking protrusion 44ca expands the diameter, thereby abutting against the side wall 45b of the sealing member 45 and pressing the side wall 45b against the inner peripheral surface of the large diameter portion 41ab. Further, the caulking protrusion 44 ca is in direct contact with the stepped portion 41 ac, that is, the negative electrode terminal 41 inside the sealing member 45. Here, the caulking protrusion 44ca is an example of a fixing portion and a plastic deformation portion.

このとき、封止部材４５の底壁部４５ａは、負極端子４１及びかしめ突出部４４ｃａが軸部４４ｃの軸方向で隣接する部分に位置し、側壁部４５ｂは、負極端子４１及びかしめ突出部４４ｃａが軸部４４ｃの径方向で隣接する部分に位置する。そして、かしめ突出部４４ｃａは、封止部材４５の底壁部４５ａ及び側壁部４５ｂをそれぞれ溝４１ｂの底部及び大径部４１ａｂの内周面に押し付けた状態で変形後の形状を維持する。このような封止部材４５は、表面４１ｃの近傍でかしめ突出部４４ｃａ及び負極端子４１と直接接触し、段差部４１ａｃと大径部４１ａｂとの隅角部において、かしめ突出部４４ｃａと負極端子４１との間隙（接触界面）を、液密に封止する。特に、かしめ接合の際に付与される押圧力を受ける底壁部４５ａは、底壁部４５ａとかしめ突出部４４ｃａとの間、及び、底壁部４５ａと負極端子４１との間を効果的に封止する。   At this time, the bottom wall portion 45a of the sealing member 45 is located in a portion where the negative electrode terminal 41 and the caulking protrusion 44ca are adjacent to each other in the axial direction of the shaft portion 44c, and the side wall portion 45b is connected to the negative electrode terminal 41 and the caulking protrusion 44ca. Is located in a portion adjacent in the radial direction of the shaft portion 44c. The caulking protrusion 44ca maintains the deformed shape in a state in which the bottom wall 45a and the side wall 45b of the sealing member 45 are pressed against the bottom of the groove 41b and the inner peripheral surface of the large diameter portion 41ab, respectively. Such a sealing member 45 is in direct contact with the caulking protrusion 44ca and the negative electrode terminal 41 in the vicinity of the surface 41c, and at the corner between the stepped portion 41ac and the large diameter portion 41ab, the caulking protrusion 44ca and the negative electrode terminal 41 are provided. The gap (contact interface) is sealed in a liquid-tight manner. In particular, the bottom wall portion 45a that receives the pressing force applied during the caulking joining is effective between the bottom wall portion 45a and the caulking protrusion 44ca and between the bottom wall portion 45a and the negative electrode terminal 41. Seal.

段差部４１ａｃよりも突出する底壁部４５ａは、Ｚ軸方向でのかしめ突出部４４ｃａと段差部４１ａｃとの間のこれらの接触界面の外周縁を外側から覆うように延在する。よって、封止部材４５は、外部からかしめ突出部４４ｃａと大径部４１ａｂの内周面との間隙に流入した液体が、かしめ突出部４４ｃａ及び段差部４１ａｃの接触界面に侵入することをより一層確実に抑制する。   The bottom wall portion 45a protruding from the step portion 41ac extends so as to cover the outer peripheral edge of these contact interfaces between the caulking protrusion portion 44ca and the step portion 41ac in the Z-axis direction from the outside. Therefore, the sealing member 45 further prevents the liquid that has flowed into the gap between the caulking protrusion 44ca and the inner peripheral surface of the large diameter portion 41ab from entering the contact interface between the caulking protrusion 44ca and the stepped portion 41ac. Surely suppress.

さらに、段差部４１ａｃと略垂直に延びる封止部材４５の側壁部４５ｂは、かしめ突出部４４ｃａと大径部４１ａｂの内周面との間隙に流入した液体によって、かしめ突出部４４ｃａと負極端子４１とが導通することを抑制する。なお、上記液体として、水分等が挙げられる。気候の変動により、蓄電素子１００の周囲の水蒸気が液化して、負極端子４１上に結露等として発生する場合がある。   Further, the side wall portion 45b of the sealing member 45 extending substantially perpendicularly to the stepped portion 41ac is caused by the liquid flowing into the gap between the caulking projection portion 44ca and the inner peripheral surface of the large diameter portion 41ab, and the caulking projection portion 44ca and the negative electrode terminal 41. And is prevented from conducting. In addition, a water | moisture content etc. are mentioned as said liquid. Due to climate change, water vapor around the storage element 100 may be liquefied and generated on the negative electrode terminal 41 as condensation or the like.

例えば、図５Ｂを参照すると、図５Ａにおいて封止部材４５が取り除かれたケースが示されている。なお、図５Ｂでは、負極端子４１の段差部４１ａｃ上の溝４１ｂは、省略されている。このような場合、かしめ突出部４４ｃａと負極端子４１とは、負極端子４１の表面４１ｃから、大径部４１ａｂ及び段差部４１ａｃを通り、かしめ突出部４４ｃａの根元部分の軸部４４ｃにわたる接触部分において、直接接触し得る。よって、図５Ａに示すように封止部材４５が設けられる場合、封止部材４５は、図５Ｂにおいて破線示すように、上記接触部分において、かしめ突出部４４ｃａ及び負極端子４１の接触界面に配置されることになる。なお、封止部材４５が設けられることによって接触しなくなるかしめ突出部４４ｃａ及び負極端子４１の接触界面についても、本明細書及び特許請求の範囲において、接触界面と呼ぶ。このような接触界面の例は、負極端子４１の大径部４１ａｂの内周面、負極端子４１の溝４１ｂの底面、及びこれらに対向するかしめ突出部４４ｃａの表面である。   For example, referring to FIG. 5B, a case where the sealing member 45 is removed in FIG. 5A is shown. In FIG. 5B, the groove 41b on the step portion 41ac of the negative electrode terminal 41 is omitted. In such a case, the caulking protrusion 44ca and the negative electrode terminal 41 are in contact with each other from the surface 41c of the negative electrode terminal 41 through the large diameter portion 41ab and the stepped portion 41ac to the shaft portion 44c of the root portion of the caulking protrusion 44ca. Can be in direct contact. Therefore, when the sealing member 45 is provided as shown in FIG. 5A, the sealing member 45 is disposed at the contact interface between the caulking protrusion 44ca and the negative electrode terminal 41 at the contact portion as shown by the broken line in FIG. 5B. Will be. Note that the contact interface between the caulking protrusion 44 ca and the negative electrode terminal 41 that do not come into contact with each other when the sealing member 45 is provided is also referred to as a contact interface in the present specification and claims. Examples of such a contact interface are the inner peripheral surface of the large-diameter portion 41ab of the negative electrode terminal 41, the bottom surface of the groove 41b of the negative electrode terminal 41, and the surface of the caulking protrusion 44ca facing these.

封止部材４５が設けられない場合、上記接触部分の間隙、つまり、かしめ突出部４４ｃａ及び負極端子４１の接触界面に液体が浸透し、浸透した液体は、接触界面を通る浸透経路Ｌ１を形成する可能性がある。浸透経路Ｌ１は、接触部分と同様に、負極端子４１の表面４１ｃから、大径部４１ａｂ及び段差部４１ａｃを通り、かしめ突出部４４ｃａの根元部分の軸部４４ｃに至る可能性がある。そして、浸透経路Ｌ１では、液体は、表面４１ｃから軸部４４ｃに向かう一点鎖線矢印の方向に流れ得る。   When the sealing member 45 is not provided, the liquid penetrates into the gap between the contact portions, that is, the contact interface between the caulking protrusion 44ca and the negative electrode terminal 41, and the penetrated liquid forms an infiltration path L1 passing through the contact interface. there is a possibility. Like the contact portion, the permeation path L1 may pass from the surface 41c of the negative electrode terminal 41 through the large diameter portion 41ab and the stepped portion 41ac to the shaft portion 44c of the root portion of the caulking protrusion 44ca. Then, in the permeation path L1, the liquid can flow in the direction of the dashed-dotted arrow from the surface 41c toward the shaft portion 44c.

図５Ａ及び図５Ｂに示すように、封止部材４５は、かしめ突出部４４ｃａ及び負極端子４１の接触界面の端部、具体的には、かしめ突出部４４ｃａ及び負極端子４１の間隙の入口に配置されている。このような封止部材４５は、浸透経路Ｌ１において、一点鎖線矢印に沿う液体の流れの方向の最も上流側の位置に配置されて、浸透経路Ｌ１を封鎖し、当該経路への液体の侵入を阻止する。封止部材４５は、浸透経路Ｌ１の入口を封鎖するため、上記接触部分の大部分、つまり、接触界面の大部分において、液体によるかしめ突出部４４ｃａと負極端子４１との電気的な接続を阻む。なお、浸透経路Ｌ１の入口は、浸透経路Ｌ１において、軸部４４ｃから最も遠位に位置する。また、浸透経路Ｌ１は、大径部４１ａｂ及び段差部４１ａｃの隅角部において屈曲する。封止部材４５は、液体が流れにくくなる浸透経路Ｌ１の屈曲部分、及びその上下流にわたって連続して配置され、屈曲部分及びその上下流の浸透経路Ｌ１を封鎖するため、効果的な封止を可能にする。   As shown in FIGS. 5A and 5B, the sealing member 45 is disposed at the end of the contact interface between the caulking protrusion 44ca and the negative electrode terminal 41, specifically, at the entrance of the gap between the caulking protrusion 44ca and the negative electrode terminal 41. Has been. Such a sealing member 45 is arranged at the most upstream position in the liquid flow direction along the one-dot chain line arrow in the permeation path L1, blocks the permeation path L1, and prevents the liquid from entering the path. Stop. The sealing member 45 blocks the entrance of the permeation path L1, and therefore prevents electrical connection between the caulking protrusion 44ca and the negative electrode terminal 41 due to the liquid in most of the contact portion, that is, most of the contact interface. . The entrance of the permeation path L1 is located farthest from the shaft portion 44c in the permeation path L1. Further, the permeation path L1 is bent at the corners of the large diameter part 41ab and the step part 41ac. The sealing member 45 is arranged continuously over the bent portion of the permeation path L1 where the liquid hardly flows, and the upstream and downstream thereof, and seals the bent portion and the permeation path L1 upstream and downstream thereof, so that effective sealing is achieved. to enable.

また、封止部材４５において、底壁部４５ａ及び側壁部４５ｂによる隅角部の内面、つまり、屈曲した内面は、その屈曲部分を跨いで全体的に、かしめ突出部４４ｃａと当接する。すなわち、屈曲した内面における、向きが異なり且つ隣り合う２つの面が、かしめ突出部４４ｃａと当接する。このため、封止部材４５は、封止部材４５及びかしめ突出部４４ｃａの接触界面への液体の侵入を効果的に阻止する。また、封止部材４５において、底壁部４５ａ及び側壁部４５ｂによる角部の外面、つまり、屈曲した外面は、その屈曲部分を跨いで全体的に、負極端子４１と当接する。すなわち、屈曲した外面における、向きが異なり且つ隣り合う２つの面が、負極端子４１と当接する。このため、封止部材４５は、封止部材４５及び負極端子４１の接触界面への液体の侵入を効果的に阻止する。このように、封止部材４５において、向きが異なり且つ隣り合う複数の面が、かしめ突出部４４ｃａ及び負極端子４１と接触することによって、封止部材４５の封止能力が向上する。   Further, in the sealing member 45, the inner surface of the corner portion by the bottom wall portion 45a and the side wall portion 45b, that is, the bent inner surface straddles the bent portion and entirely contacts the caulking protrusion 44ca. In other words, two adjacent surfaces with different directions on the bent inner surface abut on the caulking protrusion 44ca. For this reason, the sealing member 45 effectively prevents liquid from entering the contact interface between the sealing member 45 and the caulking protrusion 44ca. Further, in the sealing member 45, the outer surface of the corner portion by the bottom wall portion 45a and the side wall portion 45b, that is, the bent outer surface is in contact with the negative electrode terminal 41 across the bent portion. That is, two adjacent surfaces that are different in direction and adjacent to each other on the bent outer surface are in contact with the negative electrode terminal 41. For this reason, the sealing member 45 effectively prevents liquid from entering the contact interface between the sealing member 45 and the negative electrode terminal 41. Thus, in the sealing member 45, the sealing surfaces of the sealing member 45 are improved by contacting a plurality of adjacent surfaces having different orientations with the caulking protrusion 44 ca and the negative electrode terminal 41.

また、封止部材４５において、底壁部４５ａ及び側壁部４５ｂによる隅角部の内面も、底壁部４５ａ及び側壁部４５ｂによる角部の外面も、かしめ突出部４４ｃａ及び段差部４１ａｃの接触界面に対しＺ軸方向にずれて位置し、面一となっていない。このため、かしめ突出部４４ｃａ及び封止部材４５の接触界面から、かしめ突出部４４ｃａ及び段差部４１ａｃの接触界面への液体の浸透が抑えられる。同様に、負極端子４１及び封止部材４５の接触界面から、かしめ突出部４４ｃａ及び段差部４１ａｃの接触界面への液体の浸透が抑えられる。   Further, in the sealing member 45, both the inner surface of the corner portion by the bottom wall portion 45a and the side wall portion 45b and the outer surface of the corner portion by the bottom wall portion 45a and the side wall portion 45b are the contact interfaces of the caulking protrusion 44ca and the step portion 41ac. In contrast, it is displaced in the Z-axis direction and is not flush. For this reason, the permeation | transmission of the liquid from the contact interface of the crimping protrusion part 44ca and the sealing member 45 to the contact interface of the crimping protrusion part 44ca and the level | step-difference part 41ac is suppressed. Similarly, the penetration of the liquid from the contact interface between the negative electrode terminal 41 and the sealing member 45 to the contact interface between the caulking protrusion 44ca and the stepped portion 41ac is suppressed.

上述のような封止部材４５は、互いに異種金属で構成される負極集電部材４４と負極端子４１との間での、液体に起因するガルバニック腐食の発生を抑制する。なお、上述したように、封止部材４５は、異種金属で構成される構成要素間への外部からの液体の侵入を効果的に抑制するために、容器１０の外側に位置する構成要素の界面に対して配置されることが、望ましい。さらに、封止部材４５は、異種金属で構成される２つの構成要素の２つの界面の外周縁を外側から跨ぎ且つ覆うように配置されることが、望ましい。また、構成要素と封止部材４５との間隙を小さくし確実な封止を得るために、封止部材４５による封止は、かしめ加工の際の押圧力の付与方向でもある軸部４４ｃの軸方向で、負極集電部材４４及び負極端子４１の間、つまりこれらが隣接する部分に配置されることが、望ましい。さらに、液体による負極集電部材４４と負極端子４１との導通を抑制するために、封止部材４５は、側壁部４５ｂ等によって、軸部４４ｃの軸方向と異なる方向でも、かしめ突出部４４ｃａと負極端子４１との間に介在することが、望ましい。   The sealing member 45 as described above suppresses the occurrence of galvanic corrosion due to the liquid between the negative electrode current collecting member 44 and the negative electrode terminal 41 which are made of different metals. Note that, as described above, the sealing member 45 is an interface between the constituent elements located outside the container 10 in order to effectively suppress the intrusion of liquid from the outside between the constituent elements made of different metals. It is desirable to be arranged with respect to. Furthermore, it is desirable that the sealing member 45 is disposed so as to straddle and cover the outer peripheral edges of the two interfaces of the two constituent elements made of different metals from the outside. Further, in order to reduce the gap between the component and the sealing member 45 and to obtain a reliable sealing, the sealing by the sealing member 45 is the axis of the shaft portion 44c which is also the direction in which the pressing force is applied during the caulking process. In the direction, it is desirable that the negative electrode current collecting member 44 and the negative electrode terminal 41 be disposed in the adjacent portion. Further, in order to suppress conduction between the negative electrode current collecting member 44 and the negative electrode terminal 41 due to the liquid, the sealing member 45 is connected to the caulking protruding portion 44ca by a side wall portion 45b or the like in a direction different from the axial direction of the shaft portion 44c. It is desirable to interpose with the negative electrode terminal 41.

上述したように、本実施の形態に係る蓄電素子１００は、第一の導電部材としての負極端子４１と、電極体２０と電気的に接続され且つ負極端子４１と接続される第二の導電部材としての負極集電部材４４であって、容器１０の壁部としての蓋体１２を貫通して配置される負極集電部材４４と、負極端子４１と負極集電部材４４との間に配置される非金属の封止部材４５とを備える。さらに、負極端子４１及び負極集電部材４４とは、直接接触し、負極端子４１及び負極集電部材４４は、互いに異なる金属材料で構成される。そして、封止部材４５は、負極端子４１及び負極集電部材４４の接触界面に配置される。   As described above, the power storage device 100 according to the present embodiment includes the negative electrode terminal 41 as the first conductive member, and the second conductive member that is electrically connected to the electrode body 20 and connected to the negative electrode terminal 41. The negative electrode current collector 44 is disposed between the negative electrode current collector 44 and the negative electrode terminal 41 and the negative electrode current collector 44. And a non-metallic sealing member 45. Furthermore, the negative electrode terminal 41 and the negative electrode current collecting member 44 are in direct contact with each other, and the negative electrode terminal 41 and the negative electrode current collecting member 44 are made of different metal materials. The sealing member 45 is disposed at the contact interface between the negative electrode terminal 41 and the negative electrode current collecting member 44.

上述の構成において、封止部材４５は、異なる金属材料で構成される負極端子４１及び負極集電部材４４の間への液体の侵入を抑制する。これにより、負極端子４１及び負極集電部材４４が液体を介して導通することにより発生するガルバニック腐食が抑制される。よって、封止部材４５を用いた簡易な構成によって、ガルバニック腐食の抑制が可能となる。   In the above-described configuration, the sealing member 45 suppresses liquid intrusion between the negative electrode terminal 41 and the negative electrode current collector member 44 made of different metal materials. Thereby, the galvanic corrosion which generate | occur | produces when the negative electrode terminal 41 and the negative electrode current collection member 44 conduct | electrically_connect through a liquid is suppressed. Therefore, galvanic corrosion can be suppressed with a simple configuration using the sealing member 45.

なお、例えば、異種金属間のガルバニック腐食を抑えるために、負極端子４１及び負極集電部材４４の少なくとも一方に、ニッケルメッキ等の導電性のコーティングを設けることも考えられる。この場合、導電性のコーティングは、負極端子４１及び負極集電部材４４の接触部分を少なくとも覆うように設けられる。ニッケルメッキ等の導電性のコーティングは、負極端子４１と負極集電部材４４との間に介在することによって、負極端子４１及び負極集電部材４４間での導通を可能にするが、イオンの移動を抑制する。しかしながら、本実施の形態のように、負極端子４１と負極集電部材４４の軸部４４ｃとがかしめ接合される場合、２つの部材の間での摺動によって、導電性のコーティングが剥れ、ガルバニック腐食が発生する可能性がある。本実施の形態に係る蓄電素子１００における封止部材４５は、上述のようなかしめ接合に起因するガルバニック腐食の発生を抑えることができる。さらに、封止部材４５は、かしめ接合された負極端子４１及び負極集電部材４４によって、これらの間で押圧される。このため、封止部材４５は、負極端子４１及び負極集電部材４４間の封止能力を高めることができる。   For example, in order to suppress galvanic corrosion between different metals, it is also conceivable to provide a conductive coating such as nickel plating on at least one of the negative electrode terminal 41 and the negative electrode current collecting member 44. In this case, the conductive coating is provided so as to cover at least the contact portion between the negative electrode terminal 41 and the negative electrode current collecting member 44. A conductive coating such as nickel plating is interposed between the negative electrode terminal 41 and the negative electrode current collector member 44, thereby enabling conduction between the negative electrode terminal 41 and the negative electrode current collector member 44. Suppress. However, when the negative electrode terminal 41 and the shaft portion 44c of the negative electrode current collecting member 44 are caulked and joined as in the present embodiment, the conductive coating is peeled off by sliding between the two members, Galvanic corrosion can occur. Sealing member 45 in power storage element 100 according to the present embodiment can suppress the occurrence of galvanic corrosion due to caulking and bonding as described above. Further, the sealing member 45 is pressed between the negative electrode terminal 41 and the negative electrode current collecting member 44 which are caulked and joined. For this reason, the sealing member 45 can enhance the sealing capability between the negative electrode terminal 41 and the negative electrode current collecting member 44.

実施の形態に係る蓄電素子１００において、封止部材４５は、負極端子４１及び負極集電部材４４の接触界面の端部に配置される。上記構成において、封止部材４５は、負極端子４１及び負極集電部材４４の接触界面の入口、つまり、負極端子４１及び負極集電部材４４の間隙の入口の付近に位置する。このような封止部材４５は、接触界面への液体の浸入を効果的に抑制し、接触界面の大部分において、液体による負極端子４１及び負極集電部材４４の電気的な接続を阻むことができる。   In the energy storage device 100 according to the embodiment, the sealing member 45 is disposed at the end of the contact interface between the negative electrode terminal 41 and the negative electrode current collecting member 44. In the above configuration, the sealing member 45 is located near the entrance of the contact interface between the negative terminal 41 and the negative current collector 44, that is, near the entrance of the gap between the negative terminal 41 and the negative current collector 44. Such a sealing member 45 effectively suppresses liquid intrusion into the contact interface, and prevents electrical connection between the negative electrode terminal 41 and the negative electrode current collecting member 44 by the liquid in most of the contact interface. it can.

実施の形態に係る蓄電素子１００において、負極集電部材４４は、蓋体１２を貫通する軸部４４ｃと、軸部４４ｃを蓋体１２に固定する固定部とを含む。例えば、固定部は、軸部４４ｃの端部の塑性変形部としてのかしめ突出部４４ｃａによって構成される。上述の構成において、蓋体１２を貫通する軸部４４ｃが、その一部であるかしめ突出部４４ｃａによって固定されるため、軸部４４ｃの固定強度が向上する。本実施の形態では、かしめ突出部４４ｃａは、負極端子４１を蓋体１２に直接的に固定している。このため、負極端子４１の強度が向上する。さらに、かしめ突出部４４ｃａを形成するかしめ加工の際、負極端子４１及び軸部４４ｃの処理工程が不要であり、コスト低減が可能になる。   In the electricity storage device 100 according to the embodiment, the negative electrode current collecting member 44 includes a shaft portion 44 c that penetrates the lid body 12 and a fixing portion that fixes the shaft portion 44 c to the lid body 12. For example, the fixed portion is constituted by a caulking protrusion 44ca as a plastic deformation portion at the end of the shaft portion 44c. In the above-described configuration, the shaft portion 44c penetrating the lid body 12 is fixed by the caulking protrusion portion 44ca that is a part of the shaft portion 44c, so that the fixing strength of the shaft portion 44c is improved. In the present embodiment, the caulking protrusion 44 ca directly fixes the negative electrode terminal 41 to the lid body 12. For this reason, the strength of the negative electrode terminal 41 is improved. Furthermore, when the caulking process for forming the caulking protrusion 44ca is performed, the processing steps for the negative electrode terminal 41 and the shaft portion 44c are unnecessary, and the cost can be reduced.

実施の形態に係る蓄電素子１００において、封止部材４５は、負極端子４１及びかしめ突出部４４ｃａが軸部４４ｃの軸方向で隣接する部分に配置される。上述の構成において、例えば、軸部４４ｃが、その端部にかしめ等の塑性加工を受けて固定されている場合、かしめ突出部４４ｃａは、負極端子４１を軸方向に押圧した状態で軸部４４ｃを蓋体１２に固定している。このため、封止部材４５、かしめ突出部４４ｃａ及び負極端子４１の間の隙間が低減し、封止部材４５による効果的な封止が得られる。   In the energy storage device 100 according to the embodiment, the sealing member 45 is disposed at a portion where the negative electrode terminal 41 and the caulking protrusion 44ca are adjacent to each other in the axial direction of the shaft portion 44c. In the above-described configuration, for example, when the shaft portion 44c is fixed by being subjected to plastic processing such as caulking at the end thereof, the caulking projection portion 44ca is pressed with the negative electrode terminal 41 in the axial direction. Is fixed to the lid 12. For this reason, the clearance gap between the sealing member 45, the crimping protrusion part 44ca, and the negative electrode terminal 41 reduces, and effective sealing by the sealing member 45 is obtained.

実施の形態に係る蓄電素子１００において、封止部材４５の硬度は、負極端子４１及び負極集電部材４４の硬度よりも低い。上述の構成において、封止部材４５は、負極端子４１及び負極集電部材４４の間で押圧力を受けることによって、これらにおける接触面の形状に対応して変形し、負極端子４１及び負極集電部材４４との間の封止を向上することができる。   In the energy storage device 100 according to the embodiment, the hardness of the sealing member 45 is lower than the hardness of the negative electrode terminal 41 and the negative electrode current collecting member 44. In the above-described configuration, the sealing member 45 receives a pressing force between the negative electrode terminal 41 and the negative electrode current collecting member 44, and is deformed corresponding to the shape of the contact surface between them. Sealing with the member 44 can be improved.

なお、実施の形態に係る蓄電素子１００において、封止部材４５は、径方向において、Ｌ字状の断面形状を有していたが、封止部材４５の形状はこれに限定されない。封止部材４５の形状は、負極端子４１及び負極集電部材４４の接触界面を液密に封止できる形状であればよい。例えば、封止部材４５の断面形状は、Ｉ字状、Ｓ字状又はＺ字状であってもよい。例えば、このような封止部材４５は、負極端子４１の大径部４１ａｂの内周面と隣接して配置されてもよく、負極端子４１の段差部４１ａｃの表面と隣接して配置されてもよい。   Note that in the energy storage device 100 according to the embodiment, the sealing member 45 has an L-shaped cross-sectional shape in the radial direction, but the shape of the sealing member 45 is not limited thereto. The shape of the sealing member 45 may be any shape that can liquid-tightly seal the contact interface between the negative electrode terminal 41 and the negative electrode current collector member 44. For example, the cross-sectional shape of the sealing member 45 may be an I shape, an S shape, or a Z shape. For example, such a sealing member 45 may be disposed adjacent to the inner peripheral surface of the large-diameter portion 41ab of the negative electrode terminal 41, or may be disposed adjacent to the surface of the step portion 41ac of the negative electrode terminal 41. Good.

［変形例１］
以下、図６を参照して、実施の形態の変形例１に係る蓄電素子を説明する。図６は、変形例１に係る蓄電素子の負極端子４１及びその周辺の構成を、図５Ａと同様に示す断面側面図である。なお、実施の形態と同様の点に関しては説明を省略する。変形例１に係る蓄電素子は、封止部材４５に加えて、負極端子４１と負極集電部材４４の軸部４４ｃとが隣接する部分にも封止部材４６を備える点で、実施の形態に係る蓄電素子と異なる。本変形例では、封止部材が配置される負極端子に関する構成のみを説明する。 [Modification 1]
Hereinafter, with reference to FIG. 6, the electrical storage element which concerns on the modification 1 of embodiment is demonstrated. FIG. 6 is a cross-sectional side view showing the configuration of the negative electrode terminal 41 of the electricity storage device according to the first modification and the periphery thereof in the same manner as FIG. 5A. Note that a description of the same points as in the embodiment is omitted. In addition to the sealing member 45, the electricity storage device according to Modification 1 includes the sealing member 46 in a portion where the negative electrode terminal 41 and the shaft portion 44 c of the negative electrode current collector 44 are adjacent to each other. It differs from the electric storage element. In this modification, only the configuration related to the negative electrode terminal on which the sealing member is disposed will be described.

変形例１に係る蓄電素子は、負極端子４１と上部絶縁部材４２との間に、環状の第二封止部材４６を備え、第二封止部材４６は、負極集電部材４４の軸部４４ｃに外側で隣接し且つ軸部４４ｃの外周を囲むように配置されている。第二封止部材４６は、封止部材（以下、第一封止部材とも呼ぶ）４５と同様の材料で構成されてもよく、上述した第一封止部材４５の構成材料から任意に選択された材料で構成されてもよい。   The electricity storage device according to Modification 1 includes an annular second sealing member 46 between the negative electrode terminal 41 and the upper insulating member 42, and the second sealing member 46 is a shaft portion 44 c of the negative electrode current collecting member 44. Is arranged outside so as to surround the outer periphery of the shaft portion 44c. The second sealing member 46 may be made of the same material as the sealing member (hereinafter also referred to as the first sealing member) 45, and is arbitrarily selected from the constituent materials of the first sealing member 45 described above. It may be made of different materials.

負極端子４１の表面４１ｄには、環状の溝４１ｅが、小径部４１ａａに隣接し且つ小径部４１ａａの周囲を囲んで形成されている。溝４１ｅは、矩形状の断面形状を有している。第二封止部材４６も、第一封止部材４５と同様に、Ｌ字状の断面形状を有している。第二封止部材４６は、溝４１ｅ内に配置される。このとき、第二封止部材４６は、その底壁部４６ａの内周面で軸部４４ｃの外周面と当接し、その側壁部４６ｂの軸方向の端面で上部絶縁部材４２と当接し、底壁部４６ａの軸方向の端面及び側壁部４６ｂの外周面で負極端子４１と当接する。さらに、底壁部４６ａ及び側壁部４６ｂが軸部４４ｃの周りに形成する窪みに、下部絶縁部材４３の筒部４３ａの先端が嵌合する。これにより、第二封止部材４６は、負極端子４１と軸部４４ｃとの間を封止し、負極端子４１と上部絶縁部材４２との間を封止する。さらに、筒部４３ａが、負極端子４１及び上部絶縁部材４２の間のＸＹ平面に沿う方向のこれらの界面と交差するように延在する。これにより、負極端子４１と上部絶縁部材４２との間の封止が、より確実になる。   An annular groove 41e is formed on the surface 41d of the negative electrode terminal 41 so as to be adjacent to the small diameter portion 41aa and surrounding the small diameter portion 41aa. The groove 41e has a rectangular cross-sectional shape. Similarly to the first sealing member 45, the second sealing member 46 has an L-shaped cross-sectional shape. The second sealing member 46 is disposed in the groove 41e. At this time, the second sealing member 46 is in contact with the outer peripheral surface of the shaft portion 44c at the inner peripheral surface of the bottom wall portion 46a, and is in contact with the upper insulating member 42 at the end surface in the axial direction of the side wall portion 46b. It contacts the negative electrode terminal 41 at the end face in the axial direction of the wall 46a and the outer peripheral surface of the side wall 46b. Further, the tip of the cylindrical portion 43a of the lower insulating member 43 is fitted into a recess formed by the bottom wall portion 46a and the side wall portion 46b around the shaft portion 44c. Accordingly, the second sealing member 46 seals between the negative electrode terminal 41 and the shaft portion 44 c and seals between the negative electrode terminal 41 and the upper insulating member 42. Further, the cylindrical portion 43 a extends so as to intersect these interfaces in the direction along the XY plane between the negative electrode terminal 41 and the upper insulating member 42. Thereby, the sealing between the negative electrode terminal 41 and the upper insulating member 42 becomes more reliable.

また、かしめ突出部４４ｃａの形成時、負極端子４１は、上部絶縁部材４２に押し付けられる。これにより、第二封止部材４６は、変形し、押圧力を伴って上記の各構成要素に当接する。よって、第二封止部材４６と各構成要素との間の封止が、より確実になる。   Further, the negative electrode terminal 41 is pressed against the upper insulating member 42 when the caulking protrusion 44 ca is formed. Thereby, the 2nd sealing member 46 deform | transforms and contact | abuts to said each component with a pressing force. Therefore, the sealing between the second sealing member 46 and each component is more reliable.

上述のような第二封止部材４６は、負極端子４１の小径部４１ａａ及び負極集電部材４４の軸部４４ｃの接触界面の端部、具体的には、小径部４１ａａ及び軸部４４ｃの間隙の入口に配置されている。第二封止部材４６は、負極端子４１と上部絶縁部材４２との間に侵入した液体がこれらの界面を通って、小径部４１ａａ及び軸部４４ｃの接触界面に至ることを抑制する。また、第二封止部材４６は、容器１０内の電解液が、負極集電部材４４の軸部４４ｃ、下部絶縁部材４３の筒部４３ａ等をつたって、小径部４１ａａ及び軸部４４ｃの接触界面に侵入することを抑制する。これにより、負極端子４１及び負極集電部材４４のガルバニック腐食の発生が抑制される。   The second sealing member 46 as described above is an end portion of the contact interface between the small diameter portion 41aa of the negative electrode terminal 41 and the shaft portion 44c of the negative electrode current collecting member 44, specifically, a gap between the small diameter portion 41aa and the shaft portion 44c. Located at the entrance. The second sealing member 46 prevents the liquid that has entered between the negative electrode terminal 41 and the upper insulating member 42 from passing through these interfaces and reaching the contact interface between the small-diameter portion 41aa and the shaft portion 44c. Further, the second sealing member 46 is configured so that the electrolyte in the container 10 contacts the small diameter portion 41aa and the shaft portion 44c through the shaft portion 44c of the negative electrode current collecting member 44, the cylindrical portion 43a of the lower insulating member 43, and the like. Suppresses entering the interface. Thereby, generation | occurrence | production of the galvanic corrosion of the negative electrode terminal 41 and the negative electrode current collection member 44 is suppressed.

よって、変形例１に係る蓄電素子によれば、実施の形態と同様の効果が得られる。さらに、変形例１に係る蓄電素子において、第二封止部材４６は、負極端子４１及び負極集電部材４４の軸部４４ｃが隣接する部分に配置される。上述の構成において、第二封止部材４６は、負極端子４１と軸部４４ｃとの間を通る液体の侵入を抑制する。例えば、第一封止部材４５と第二封止部材４６とがそれぞれ、かしめ突出部４４ｃａ及び負極端子４１の間と、軸部４４ｃ及び負極端子４１の間とに配置されれば、かしめ突出部４４ｃａから容器１０の内部に向かう方向とその反対方向との両方から負極端子４１及び負極集電部材４４の間への液体の侵入を抑制することが可能になる。また、第二封止部材４６は、負極端子４１及び負極集電部材４４の接触界面の端部に配置されるため、当該接触界面の大部分において液体の浸入を抑制することができる。   Therefore, according to the electricity storage device according to Modification Example 1, the same effect as in the embodiment can be obtained. Further, in the power storage device according to the first modification, the second sealing member 46 is disposed in a portion where the negative electrode terminal 41 and the shaft portion 44 c of the negative electrode current collecting member 44 are adjacent to each other. In the above-described configuration, the second sealing member 46 suppresses intrusion of liquid passing between the negative electrode terminal 41 and the shaft portion 44c. For example, if the 1st sealing member 45 and the 2nd sealing member 46 are each arrange | positioned between the caulking protrusion part 44ca and the negative electrode terminal 41, and between the axial part 44c and the negative electrode terminal 41, it will be caulking protrusion part. It becomes possible to suppress the intrusion of the liquid between the negative electrode terminal 41 and the negative electrode current collecting member 44 from both the direction from 44 ca toward the inside of the container 10 and the opposite direction. In addition, since the second sealing member 46 is disposed at the end portion of the contact interface between the negative electrode terminal 41 and the negative electrode current collecting member 44, it is possible to suppress the intrusion of liquid in most of the contact interface.

［変形例２］
以下、図７を参照して、実施の形態の変形例２に係る蓄電素子を説明する。図７は、変形例２に係る蓄電素子の負極端子４１及びその周辺の構成を、図５Ａと同様に示す断面側面図である。なお、実施の形態及び変形例１と同様の点に関しては説明を省略する。変形例２に係る蓄電素子は、実施の形態に係る蓄電素子１００において、負極集電部材４４のかしめ突出部４４ｃａが負極端子４１の表面４１ｃよりも窪んで位置するように構成されている。本変形例でも、封止部材が配置される負極端子に関する構成のみを説明する。 [Modification 2]
Hereinafter, with reference to FIG. 7, the electrical storage element which concerns on the modification 2 of embodiment is demonstrated. FIG. 7 is a cross-sectional side view showing the configuration of the negative electrode terminal 41 of the electricity storage device according to Modification 2 and the periphery thereof in the same manner as FIG. 5A. In addition, description is abbreviate | omitted about the point similar to embodiment and the modification 1. FIG. The electricity storage device according to Modification 2 is configured such that the caulking protrusion 44 ca of the negative electrode current collecting member 44 is positioned to be recessed from the surface 41 c of the negative electrode terminal 41 in the electricity storage device 100 according to the embodiment. Also in this modification, only the structure regarding the negative electrode terminal in which a sealing member is arrange | positioned is demonstrated.

具体的には、変形例２に係る蓄電素子において、負極集電部材４４のかしめ突出部４４ｃａにおけるＺ軸方向の突出端部分４４ｃａａが、負極端子４１の表面４１ｃよりも窪む、つまりＺ軸方向に後退している。これにより、かしめ突出部４４ｃａの全体が、表面４１ｃよりも、Ｚ軸方向つまり軸部４４ｃの軸方向に後退している。よって、バスバー等の導電部材が、負極端子４１の表面４１ｃ上に貫通孔４１ａ上を横断するように配置され、負極端子４１と接続される場合、導電部材とかしめ突出部４４ｃａとは、互いに接触しない。例えば、導電部材と負極集電部材４４とが異種金属で構成されていても、これらの間でのガルバニック腐食の発生が抑制される。   Specifically, in the energy storage device according to Modification 2, the projecting end portion 44caa in the Z-axis direction of the caulking projecting portion 44ca of the negative electrode current collecting member 44 is recessed from the surface 41c of the negative electrode terminal 41, that is, in the Z-axis direction. Have retreated. As a result, the entire caulking protrusion 44ca is retracted from the surface 41c in the Z-axis direction, that is, the axial direction of the shaft portion 44c. Therefore, when a conductive member such as a bus bar is disposed on the surface 41c of the negative electrode terminal 41 so as to cross the through hole 41a and is connected to the negative electrode terminal 41, the conductive member and the caulking protrusion 44ca are in contact with each other. do not do. For example, even if the conductive member and the negative electrode current collecting member 44 are made of different metals, the occurrence of galvanic corrosion between them is suppressed.

よって、変形例２に係る蓄電素子によれば、実施の形態と同様の効果が得られる。さらに、変形例２に係る蓄電素子において、かしめ突出部４４ｃａは、負極集電部材４４の軸部４４ｃの軸方向で負極端子４１よりも窪んで位置する。上述の構成において、負極端子４１の上に導電部材が配置された場合に、この導電部材が負極集電部材４４と導通することが抑えられる。   Therefore, according to the electricity storage device according to Modification Example 2, the same effect as in the embodiment can be obtained. Furthermore, in the electricity storage device according to the modified example 2, the caulking protrusion 44 ca is positioned so as to be recessed from the negative electrode terminal 41 in the axial direction of the shaft portion 44 c of the negative electrode current collecting member 44. In the above configuration, when a conductive member is disposed on the negative electrode terminal 41, the conductive member can be prevented from conducting with the negative electrode current collecting member 44.

［変形例３］
以下、図８を参照して、実施の形態の変形例３に係る蓄電素子を説明する。図８は、変形例３に係る蓄電素子の負極端子４１及びその周辺の構成を、図５Ａと同様に示す断面側面図である。なお、実施の形態並びに変形例１及び２と同様の点に関しては説明を省略する。変形例３に係る蓄電素子は、実施の形態に係る蓄電素子１００において、負極集電部材４４のかしめ突出部４４ｃａが負極端子４１の表面４１ｃよりも突出して位置するように構成されている。本変形例でも、封止部材が配置される負極端子に関する構成のみを説明する。 [Modification 3]
Hereinafter, with reference to FIG. 8, the electrical storage element which concerns on the modification 3 of embodiment is demonstrated. FIG. 8 is a cross-sectional side view showing the configuration of the negative electrode terminal 41 of the electricity storage device according to Modification 3 and the periphery thereof in the same manner as FIG. 5A. In addition, description is abbreviate | omitted about the point similar to embodiment and the modifications 1 and 2. In the electricity storage device 100 according to the embodiment, the electricity storage device according to the third modification is configured such that the caulking protrusion 44 ca of the negative electrode current collecting member 44 protrudes from the surface 41 c of the negative electrode terminal 41. Also in this modification, only the structure regarding the negative electrode terminal in which a sealing member is arrange | positioned is demonstrated.

具体的には、変形例３に係る蓄電素子において、負極集電部材４４のかしめ突出部４４ｃａの突出端部分４４ｃａａが、負極端子４１の表面４１ｃよりもＺ軸方向に突出している。これにより、結露等によりかしめ突出部４４ｃａに付着した水分等の液体が、かしめ突出部４４ｃａ上で滞留することが、抑制される。例えば、滞留した液体は、かしめ突出部４４ｃａと負極端子４１の大径部４１ａｂとの間に侵入するおそれがあるが、上述の構成によって、当該侵入が抑制される。   Specifically, in the energy storage device according to Modification Example 3, the protruding end portion 44 caa of the caulking protruding portion 44 ca of the negative electrode current collecting member 44 protrudes in the Z-axis direction from the surface 41 c of the negative electrode terminal 41. Thereby, it is suppressed that liquid, such as a water | moisture content adhering to the caulking protrusion part 44ca by dew condensation etc., stays on the caulking protrusion part 44ca. For example, the staying liquid may enter between the caulking protrusion 44ca and the large-diameter portion 41ab of the negative electrode terminal 41, but the invasion is suppressed by the above-described configuration.

よって、変形例３に係る蓄電素子によれば、実施の形態と同様の効果が得られる。さらに、変形例３に係る蓄電素子において、かしめ突出部４４ｃａは、負極集電部材４４の軸部４４ｃの軸方向で負極端子４１よりも突出する。上述の構成において、かしめ突出部４４ｃａの上に液体が滞留することが抑えられる。かしめ突出部４４ｃａの上に滞留した液体がかしめ突出部４４ｃａと負極端子とを導通する可能性があるが、このことに起因するガルバニック腐食の発生が抑制される。   Therefore, according to the electricity storage device according to Modification 3, the same effect as in the embodiment can be obtained. Furthermore, in the electricity storage device according to Modification Example 3, the caulking protrusion 44 ca protrudes from the negative electrode terminal 41 in the axial direction of the shaft portion 44 c of the negative electrode current collector 44. In the above-described configuration, the liquid is prevented from staying on the caulking protrusion 44ca. There is a possibility that the liquid staying on the caulking protrusion 44ca may conduct between the caulking protrusion 44ca and the negative terminal, but the occurrence of galvanic corrosion due to this is suppressed.

なお、変形例３に係る蓄電素子では、かしめ突出部４４ｃａは、負極端子４１の大径部４１ａｂ内に位置する状態で、負極端子４１の表面４１ｃよりも突出していた。つまり、かしめ突出部４４ｃａの一部が負極端子４１の表面４１ｃよりも突出していたが、これに限定されず、例えば、図９に示されるように、かしめ突出部４４ｃａの全体が負極端子４１の表面４１ｃよりも突出してもよい。なお、図９は、変形例３の別の一態様に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。図９に示す例では、負極端子４１の貫通孔４１ａは、大径部４１ａｂを有さずに、小径部４１ａａで構成されている。負極端子４１の表面４１ｃ上において、貫通孔４１ａの開口の周囲を囲む環状の溝４１ｂが形成されている。さらに、環状の封止部材４５が、溝４１ｂ内に嵌め込まれ、表面４１ｃから突出する。かしめ突出部４４ｃａは、表面４１ｃ上に形成されている。かしめ突出部４４ｃａは、封止部材４５の全体を負極端子４１と共に挟み、封止部材４５の全体を負極端子４１に押し付けている。封止部材４５の断面形状は、図９の例では矩形状であるが、円形、楕円形、多角形等のいかなる形状でもよい。このような封止部材４５及びかしめ突出部４４ｃａの構成は、変形例３の場合と同様の効果を奏し得る。   In the electricity storage device according to the modification example 3, the caulking protrusion 44 ca protrudes from the surface 41 c of the negative electrode terminal 41 in a state where the caulking protrusion 44 ca is located in the large diameter portion 41 ab of the negative electrode terminal 41. That is, a part of the caulking protrusion 44ca protrudes from the surface 41c of the negative electrode terminal 41, but the present invention is not limited to this. For example, the entire caulking protrusion 44ca of the negative electrode terminal 41 is formed as shown in FIG. You may protrude rather than the surface 41c. 9 is a cross-sectional side view showing the negative electrode terminal of a power storage device according to another aspect of Modification 3 and the configuration around it, as in FIG. 5A. In the example shown in FIG. 9, the through hole 41a of the negative electrode terminal 41 does not have the large diameter portion 41ab, but is composed of the small diameter portion 41aa. On the surface 41c of the negative electrode terminal 41, an annular groove 41b surrounding the opening of the through hole 41a is formed. Further, an annular sealing member 45 is fitted into the groove 41b and protrudes from the surface 41c. The caulking protrusion 44ca is formed on the surface 41c. The caulking protrusion 44 ca sandwiches the entire sealing member 45 together with the negative electrode terminal 41 and presses the entire sealing member 45 against the negative electrode terminal 41. The cross-sectional shape of the sealing member 45 is rectangular in the example of FIG. 9, but may be any shape such as a circle, an ellipse, or a polygon. Such a configuration of the sealing member 45 and the caulking protrusion 44ca can achieve the same effects as in the third modification.

［変形例４］
以下、図１０を参照して、実施の形態の変形例４に係る蓄電素子を説明する。図１０は、変形例４に係る蓄電素子の負極端子４１及びその周辺の構成を、図５Ａと同様に示す断面側面図である。なお、実施の形態及び変形例１〜３と同様の点に関しては説明を省略する。変形例４に係る蓄電素子は、実施の形態に係る蓄電素子１００において、負極集電部材４４の軸部４４ｃがベース４４ａと別個の部材であるように構成されている。本変形例でも、封止部材が配置される負極端子に関する構成のみを説明する。 [Modification 4]
Hereinafter, with reference to FIG. 10, the electrical storage element which concerns on the modification 4 of embodiment is demonstrated. FIG. 10 is a cross-sectional side view showing the configuration of the negative electrode terminal 41 of the electricity storage device according to Modification 4 and the periphery thereof in the same manner as FIG. 5A. In addition, description is abbreviate | omitted regarding the point similar to embodiment and the modifications 1-3. The electricity storage device according to the modification 4 is configured such that the shaft portion 44c of the negative electrode current collecting member 44 is a separate member from the base 44a in the electricity storage device 100 according to the embodiment. Also in this modification, only the structure regarding the negative electrode terminal in which a sealing member is arrange | positioned is demonstrated.

変形例４に係る蓄電素子において、負極集電部材２４４は、実施の形態に係る集電部材４４と同様に、ベース４４ａ及び脚部４４ｂを備えているが、軸部４４ｃを備えていない。変形例４に係る蓄電素子は、フランジ付きの円筒状の軸部材４７を備えており、軸部材４７は、負極端子４１、上部絶縁部材４２、蓋体１２、下部絶縁部材４３及びベース４４ａを貫通して延びる。軸部材４７は、円筒状の軸本体部４７ｂと、軸本体部４７ｂの軸方向の一方の端部から径方向に拡がって延在する円板状のフランジ部４７ａとを一体的に含む。軸部材４７は、フランジ部４７ａに負極端子４１の大径部４１ａｂ内の段差部４１ａｃ上に位置させ、軸本体部４７ｂに負極端子４１からベース４４ａを貫通させて、配置される。フランジ部４７ａは、封止部材４５上に至って延在し、フランジ部４７ａの周縁が、封止部材４５の底壁部４５ａ及び側壁部４５ｂの内側に形成される窪みに嵌る。ここで、軸部材４７は、第二の導電部材の一例である。   In the electricity storage device according to Modification 4, the negative electrode current collector 244 includes the base 44a and the legs 44b, but does not include the shaft 44c, like the current collector 44 according to the embodiment. The power storage device according to the modified example 4 includes a cylindrical shaft member 47 with a flange. The shaft member 47 penetrates the negative electrode terminal 41, the upper insulating member 42, the lid body 12, the lower insulating member 43, and the base 44a. And extend. The shaft member 47 integrally includes a cylindrical shaft main body portion 47b and a disk-like flange portion 47a extending in a radial direction from one axial end portion of the shaft main body portion 47b. The shaft member 47 is disposed on the flange portion 47a on the stepped portion 41ac in the large-diameter portion 41ab of the negative electrode terminal 41, and is disposed in the shaft main body portion 47b through the base 44a from the negative electrode terminal 41. The flange portion 47 a extends on the sealing member 45, and the periphery of the flange portion 47 a fits into a recess formed inside the bottom wall portion 45 a and the side wall portion 45 b of the sealing member 45. Here, the shaft member 47 is an example of a second conductive member.

ベース４４ａから突出する軸本体部４７ｂの先端部分は、かしめ加工され、かしめ突出部４７ｃをベース４４ａ上で形成する。よって、軸部材４７は、負極端子４１、上部絶縁部材４２、蓋体１２、下部絶縁部材４３及びベース４４ａを、フランジ部４７ａ及びかしめ突出部４７ｃによって、軸方向内側に向かって押圧しつつ挟持する。フランジ部４７ａによって軸方向に押圧される底壁部４５ａは、フランジ部４７ａと底壁部４５ａとの間、及び、底壁部４５ａと負極端子４１との間を効果的に封止する。よって、変形例４に係る蓄電素子によれば、実施の形態と同様の効果が得られる。   The tip end portion of the shaft main body 47b protruding from the base 44a is caulked to form a caulking protrusion 47c on the base 44a. Therefore, the shaft member 47 clamps the negative electrode terminal 41, the upper insulating member 42, the lid body 12, the lower insulating member 43, and the base 44a while pressing toward the inner side in the axial direction by the flange portion 47a and the caulking protrusion 47c. . The bottom wall portion 45a pressed in the axial direction by the flange portion 47a effectively seals between the flange portion 47a and the bottom wall portion 45a and between the bottom wall portion 45a and the negative electrode terminal 41. Therefore, according to the electrical storage element which concerns on the modification 4, the effect similar to embodiment is acquired.

なお、変形例４に係る蓄電素子において、軸部材４７のフランジ部４７ａは、図１１〜図１３に示されるように、変形例２及び３で説明したかしめ突出部４４ｃａと同様の構成を有してもよい。図１１〜図１３はそれぞれ、変形例４の別の一態様に係る蓄電素子の負極端子及びその周辺の構成を、図５Ａと同様に示す断面側面図である。例えば、図１１に示される軸部材４７のフランジ部４７ａは、図７に示される変形例２でのかしめ突出部４４ｃａと同様に、軸部材４７の軸本体部４７ｂの軸方向であるＺ軸方向で負極端子４１の表面４１ｃよりも窪んで位置する。図１２に示される軸部材４７のフランジ部４７ａは、図８に示される変形例３でのかしめ突出部４４ｃａと同様に、軸本体部４７ｂの軸方向で負極端子４１の表面４１ｃよりも突出する。図１３に示される軸部材４７のフランジ部４７ａは、図９に示される変形例３の別の一態様でのかしめ突出部４４ｃａと同様に、負極端子４１の表面４１ｃ上に位置し、表面４１ｃの溝４１ｂに配置された封止部材４５の全体を負極端子４１と共に挟み、封止部材４５の全体を負極端子４１に押し付ける。図１１〜図１３に示されるフランジ部４７ａ及び封止部材４５の構成は、変形例２〜３におけるかしめ突出部４４ｃａ及び封止部材４５の構成と同様の効果を奏し得る。   In the electricity storage device according to Modification Example 4, the flange portion 47a of the shaft member 47 has the same configuration as the caulking protrusion 44ca described in Modification Examples 2 and 3, as shown in FIGS. May be. FIGS. 11 to 13 are cross-sectional side views each showing the configuration of the negative electrode terminal and its surroundings of a power storage device according to another aspect of Modification 4 as in FIG. 5A. For example, the flange portion 47a of the shaft member 47 shown in FIG. 11 is in the Z-axis direction, which is the axial direction of the shaft main body portion 47b of the shaft member 47, similarly to the caulking projection portion 44ca in the modified example 2 shown in FIG. Therefore, the negative electrode terminal 41 is positioned so as to be recessed from the surface 41c. The flange portion 47a of the shaft member 47 shown in FIG. 12 protrudes from the surface 41c of the negative electrode terminal 41 in the axial direction of the shaft main body portion 47b in the same manner as the caulking protrusion portion 44ca in the third modification shown in FIG. . The flange portion 47a of the shaft member 47 shown in FIG. 13 is located on the surface 41c of the negative electrode terminal 41, similarly to the caulking projection portion 44ca in another aspect of the modification 3 shown in FIG. The entire sealing member 45 disposed in the groove 41 b is sandwiched with the negative electrode terminal 41, and the entire sealing member 45 is pressed against the negative electrode terminal 41. The configurations of the flange portion 47a and the sealing member 45 shown in FIGS. 11 to 13 can achieve the same effects as the configurations of the caulking protrusion 44ca and the sealing member 45 in the modified examples 2-3.

［変形例５］
以下、図１４を参照して、実施の形態の変形例５に係る蓄電素子を説明する。図１４は、変形例５に係る蓄電素子の負極端子４１及び封止部材４５の構成を、図５Ａと同様の断面に示す断面側面図である。なお、実施の形態及び変形例１〜４と同様の点に関しては説明を省略する。変形例５に係る蓄電素子は、実施の形態に係る蓄電素子１００において、封止部材の底壁部に突起が形成された構成を有している。本変形例でも、封止部材が配置される負極端子に関する構成のみを説明する。 [Modification 5]
Hereinafter, with reference to FIG. 14, the electrical storage element which concerns on the modification 5 of embodiment is demonstrated. FIG. 14 is a cross-sectional side view showing the configurations of the negative electrode terminal 41 and the sealing member 45 of the energy storage device according to Modification 5 in the same cross section as FIG. 5A. In addition, description is abbreviate | omitted about the point similar to embodiment and the modifications 1-4. The power storage device according to Modification 5 has a configuration in which a protrusion is formed on the bottom wall portion of the sealing member in power storage device 100 according to the embodiment. Also in this modification, only the structure regarding the negative electrode terminal in which a sealing member is arrange | positioned is demonstrated.

変形例５に係る蓄電素子において、封止部材４５は、その底壁部４５ａの両側表面に、環状の突起である凸部４５ｃ及び４５ｄを一体的に含む。凸部４５ｃは、貫通孔４１ａの段差部４１ａｃの溝４１ｂの底部とＺ軸方向で対向する底壁部４５ａの表面に配置され、凸部４５ｄは、底壁部４５ａにおける上記表面と反対側の表面に配置される。凸部４５ｃ及び４５ｄは、円環状の底壁部４５ａの周方向に沿って延びる。   In the energy storage device according to Modification 5, the sealing member 45 integrally includes convex portions 45c and 45d that are annular protrusions on both side surfaces of the bottom wall portion 45a. The convex portion 45c is disposed on the surface of the bottom wall portion 45a facing the bottom portion of the groove 41b of the stepped portion 41ac of the through hole 41a in the Z-axis direction, and the convex portion 45d is opposite to the surface of the bottom wall portion 45a. Placed on the surface. The convex portions 45c and 45d extend along the circumferential direction of the annular bottom wall portion 45a.

かしめ加工によって形成された負極集電部材４４のかしめ突出部４４ｃａは、封止部材４５の底壁部４５ａを、Ｚ軸方向で負極端子４１に押し付ける。このとき、凸部４５ｃ及び４５ｄはそれぞれ、負極端子４１及びかしめ突出部４４ｃａに向かって突出している。さらに、凸部４５ｃ及び４５ｄはそれぞれ、底壁部４５ａにおけるこれら以外の部分よりも高い圧力で、負極端子４１及びかしめ突出部４４ｃａと接触する。よって、凸部４５ｃ及び４５ｄはそれぞれ、底壁部４５ａと負極端子４１との間、及び、底壁部４５ａとかしめ突出部４４ｃａとの間を、効果的に封止する。   The caulking protrusion 44 ca of the negative electrode current collecting member 44 formed by caulking presses the bottom wall portion 45 a of the sealing member 45 against the negative electrode terminal 41 in the Z-axis direction. At this time, the protrusions 45c and 45d protrude toward the negative electrode terminal 41 and the caulking protrusion 44ca, respectively. Further, the protrusions 45c and 45d are in contact with the negative electrode terminal 41 and the caulking protrusion 44ca, respectively, with a pressure higher than the other portions of the bottom wall portion 45a. Therefore, the convex portions 45c and 45d effectively seal between the bottom wall portion 45a and the negative electrode terminal 41 and between the bottom wall portion 45a and the caulking projection portion 44ca, respectively.

よって、変形例５に係る蓄電素子によれば、実施の形態と同様の効果が得られる。さらに、変形例５に係る蓄電素子において、封止部材４５は、負極端子４１及び負極集電部材４４に向かって突出する凸部４５ｃ及び４５ｄを含む。上述の構成において、封止部材４５は、凸部４５ｃ及び４５ｄをそれぞれ負極端子４１及び負極集電部材４４に接触させることによって、凸部４５ｃ及び４５ｄの接触圧を高めることができる。よって、封止部材４５は、負極端子４１及び負極集電部材４４との間の封止を高めることができる。なお、封止部材４５は、凸部４５ｃ及び４５ｄの一方のみが設けられるように構成されてもよい。凸部４５ｃ及び４５ｄは、封止部材４５と別個の部材を構成し、封止部材４５に取り付けられてもよい。また、凸部４５ｃ及び４５ｄは、連続する環を形成せずに、複数に分割されていてもよい。この場合、押圧された凸部４５ｃ及び４５ｄが変形し、互いの間の隙間を塞ぐことが望ましい。   Therefore, according to the electricity storage device according to Modification Example 5, the same effect as in the embodiment can be obtained. Further, in the energy storage device according to Modification 5, the sealing member 45 includes convex portions 45 c and 45 d that protrude toward the negative electrode terminal 41 and the negative electrode current collecting member 44. In the above-described configuration, the sealing member 45 can increase the contact pressure of the convex portions 45c and 45d by bringing the convex portions 45c and 45d into contact with the negative electrode terminal 41 and the negative electrode current collecting member 44, respectively. Therefore, the sealing member 45 can enhance the sealing between the negative electrode terminal 41 and the negative electrode current collecting member 44. The sealing member 45 may be configured so that only one of the convex portions 45c and 45d is provided. The convex portions 45 c and 45 d may constitute a member separate from the sealing member 45 and may be attached to the sealing member 45. Moreover, the convex parts 45c and 45d may be divided | segmented into plurality, without forming a continuous ring. In this case, it is desirable that the pressed convex portions 45c and 45d are deformed to close the gap between them.

［変形例６］
以下、図１５を参照して、実施の形態の変形例６に係る蓄電素子を説明する。図１５は、変形例６に係る蓄電素子の負極端子４１及び封止部材の構成を、図１４と同様に示す断面側面図である。なお、実施の形態及び変形例１〜５と同様の点に関しては説明を省略する。変形例６に係る蓄電素子は、実施の形態に係る蓄電素子１００において、負極端子４１及び負極集電部材４４のかしめ突出部４４ｃａに凸部が形成された構成を有している。本変形例でも、封止部材が配置される負極端子に関する構成のみを説明する。 [Modification 6]
Hereinafter, with reference to FIG. 15, the electrical storage element which concerns on the modification 6 of embodiment is demonstrated. FIG. 15 is a cross-sectional side view showing the configuration of the negative electrode terminal 41 and the sealing member of the energy storage device according to Modification 6 as in FIG. In addition, description is abbreviate | omitted about the point similar to embodiment and the modifications 1-5. The power storage device according to Modification 6 has a configuration in which convex portions are formed in the caulking protrusions 44 ca of the negative electrode terminal 41 and the negative electrode current collector 44 in the power storage device 100 according to the embodiment. Also in this modification, only the structure regarding the negative electrode terminal in which a sealing member is arrange | positioned is demonstrated.

変形例６に係る蓄電素子において、負極端子４１は、貫通孔４１ａの段差部４１ａｃの溝４１ｂの底部に、環状の突起である凸部４１ｂａを一体的に含む。凸部４１ｂａは、溝４１ｂの周方向に沿って延びる。負極集電部材４４は、軸部４４ｃにおけるかしめ突出部４４ｃａに対応する位置に、環状の突起である凸部４４ｃａｂを一体的に含む。凸部４４ｃａｂは、軸部４４ｃの外周面に沿って周方向に延び、軸部４４ｃを囲む。   In the electricity storage device according to the modified example 6, the negative electrode terminal 41 integrally includes a convex portion 41ba that is an annular projection at the bottom of the groove 41b of the step portion 41ac of the through hole 41a. The convex portion 41ba extends along the circumferential direction of the groove 41b. The negative electrode current collecting member 44 integrally includes a convex portion 44cab that is an annular projection at a position corresponding to the caulking projection portion 44ca in the shaft portion 44c. The convex portion 44cab extends in the circumferential direction along the outer peripheral surface of the shaft portion 44c and surrounds the shaft portion 44c.

かしめ加工によって形成された負極集電部材４４のかしめ突出部４４ｃａは、封止部材４５の底壁部４５ａを、Ｚ軸方向で負極端子４１に押し付ける。このとき、かしめ突出部４４ｃａに位置する凸部４４ｃａｂは、底壁部４５ａに対向して位置し、底壁部４５ａに向かって突出している。負極端子４１の凸部４１ｂａは、底壁部４５ａに対向して位置し、底壁部４５ａに向かって突出している。さらに、凸部４１ｂａ及び４４ｃａｂはそれぞれ、負極端子４１及びかしめ突出部４４ｃａにおけるこれら以外の部分よりも高い圧力で、底壁部４５ａと接触し、底壁部４５ａとの間に効果的な封止を形成する。   The caulking protrusion 44 ca of the negative electrode current collecting member 44 formed by caulking presses the bottom wall portion 45 a of the sealing member 45 against the negative electrode terminal 41 in the Z-axis direction. At this time, the convex portion 44 cab located in the caulking projection portion 44 ca is located facing the bottom wall portion 45 a and projects toward the bottom wall portion 45 a. The convex portion 41ba of the negative electrode terminal 41 is located opposite to the bottom wall portion 45a and protrudes toward the bottom wall portion 45a. Further, the convex portions 41ba and 44cab come into contact with the bottom wall portion 45a at a higher pressure than the other portions of the negative electrode terminal 41 and the caulking projection portion 44ca, respectively, and are effectively sealed between the bottom wall portion 45a. Form.

よって、変形例６に係る蓄電素子によれば、実施の形態と同様の効果が得られる。さらに、変形例６に係る蓄電素子において、負極端子４１及び負極集電部材４４は、封止部材４５に向かって突出する凸部４１ｂａ及び４４ｃａｂを含む。上述の構成において、凸部４１ｂａ及び４４ｃａｂと封止部材４５との接触によって、互いの接触圧を高めることができる。よって、凸部４１ｂａ及び４４ｃａｂを有する負極端子４１及び負極集電部材４４と封止部材４５と間の封止を高めることができる。なお、凸部４１ｂａ及び４４ｃａｂの一方のみが設けられるように構成されてもよい。凸部４１ｂａ及び４４ｃａｂはそれぞれ、負極端子４１及び負極集電部材４４と別個の部材を構成し、これらに取り付けられてもよい。また、凸部４１ｂａ及び４４ｃａｂは、連続する環を形成せずに、複数に分割されていてもよい。この場合、凸部４１ｂａ及び４４ｃａｂに押圧された封止部材４５が変形し、凸部４１ｂａ及び４４ｃａｂそれぞれの間の隙間を塞ぐことが望ましい。   Therefore, according to the electrical storage element which concerns on the modification 6, the effect similar to embodiment is acquired. Furthermore, in the power storage device according to the modified example 6, the negative electrode terminal 41 and the negative electrode current collecting member 44 include convex portions 41ba and 44cab that protrude toward the sealing member 45. In the above-described configuration, the contact pressure between the convex portions 41ba and 44cab and the sealing member 45 can be increased. Therefore, the sealing between the negative electrode terminal 41 having the convex portions 41ba and 44cab and the negative electrode current collecting member 44 and the sealing member 45 can be enhanced. In addition, you may be comprised so that only one of convex part 41ba and 44cab may be provided. The convex portions 41ba and 44cab may constitute separate members from the negative electrode terminal 41 and the negative electrode current collecting member 44, respectively, and may be attached thereto. Further, the convex portions 41ba and 44cab may be divided into a plurality of portions without forming a continuous ring. In this case, it is desirable that the sealing member 45 pressed by the convex portions 41ba and 44cab is deformed to close the gap between the convex portions 41ba and 44cab.

［その他の変形例］
以上、本発明の実施の形態及び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。本発明の範囲は上述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。 [Other variations]
The power storage device according to the embodiment and the modification of the present invention has been described above, but the present invention is not limited to the above embodiment and the modification. That is, it should be considered that the embodiment and the modification disclosed this time are examples in all respects and are not restrictive. 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.

実施の形態及び変形例に係る蓄電素子では、封止部材４５は、例えば、負極端子４１の貫通孔４１ａの溝４１ｂの深さよりも大きい厚さのようなある程度の厚さを有する部材であったが、これに限定されない。封止部材は、皮膜状、フィルム状等の薄い部材であってもよい。この場合、例えば、負極端子４１の溝４１ｂは、設けられても設けられなくてもよい。   In the energy storage device according to the embodiment and the modification, the sealing member 45 is a member having a certain thickness such as a thickness larger than the depth of the groove 41b of the through hole 41a of the negative electrode terminal 41, for example. However, it is not limited to this. The sealing member may be a thin member such as a film or film. In this case, for example, the groove 41b of the negative electrode terminal 41 may or may not be provided.

実施の形態及び変形例に係る蓄電素子では、封止部材４５は、例えば、負極端子４１の貫通孔４１ａにおいて、溝４１ｂの底部から大径部４１ａｂの内周面にわたって延在していたが、これに限定されない。封止部材は、例えば、溝４１ｂの底部及び大径部４１ａｂの内周面の一方にのみ配置されてもよい。封止部材が大径部４１ａｂの内周面にのみ設けられる場合、かしめ突出部４４ｃａの形成後に、封止部材が、大径部４１ａｂの内周面とかしめ突出部４４ｃａとの間に圧入されてもよい。   In the energy storage device according to the embodiment and the modification, for example, the sealing member 45 extends from the bottom of the groove 41b to the inner peripheral surface of the large diameter portion 41ab in the through hole 41a of the negative electrode terminal 41. It is not limited to this. For example, the sealing member may be disposed only on one of the bottom of the groove 41b and the inner peripheral surface of the large-diameter portion 41ab. When the sealing member is provided only on the inner peripheral surface of the large-diameter portion 41ab, the sealing member is press-fitted between the inner peripheral surface of the large-diameter portion 41ab and the caulking protruding portion 44ca after the formation of the caulking protruding portion 44ca. May be.

実施の形態及び変形例に係る蓄電素子では、正極集電部材及び負極集電部材がそれぞれ、下部絶縁部材と当接するベースを備えていたがこれに限定されない。正極集電部材及び負極集電部材の軸部が、脚部に直接接続されるように構成されてもよい。   In the energy storage device according to the embodiment and the modification, each of the positive electrode current collecting member and the negative electrode current collecting member includes a base that comes into contact with the lower insulating member, but the present invention is not limited thereto. The shaft portions of the positive current collecting member and the negative current collecting member may be configured to be directly connected to the leg portions.

実施の形態及び変形例に係る蓄電素子では、正極集電部材及び負極集電部材がそれぞれ、上部絶縁部材、蓋体及び下部絶縁部材を貫通する軸部を備えていたがこれに限定されない。軸部は、正極端子又は負極端子の一部として構成されてもよい。   In the energy storage device according to the embodiment and the modification, the positive electrode current collecting member and the negative electrode current collecting member are each provided with a shaft portion that penetrates the upper insulating member, the lid, and the lower insulating member, but the present invention is not limited thereto. The shaft portion may be configured as a part of the positive electrode terminal or the negative electrode terminal.

実施の形態及び変形例に係る蓄電素子は、巻回軸Ａを容器１０の蓋体１２に沿う向きにして配置される電極体２０を備える構成であったが、巻回軸Ａを蓋体１２と略垂直な向きにして配置される電極体を備える構成であってもよい。   The power storage device according to the embodiment and the modification has a configuration including the electrode body 20 arranged with the winding axis A in the direction along the lid body 12 of the container 10, but the winding axis A is the lid body 12. The electrode body may be arranged in a substantially vertical orientation.

実施の形態及び変形例に係る蓄電素子では、正極及び負極の集電部材は、電極体２０の巻回軸Ａ方向の端部と直接接続されていたが、これに限定されない。電極体は、巻回軸Ａ方向の端部に、正極板及び負極板から突出する突出片である正極タブ及び負極タブを有し、正極タブ及び負極タブがそれぞれ正極集電部材及び負極集電部材と接続されてもよい。   In the energy storage device according to the embodiment and the modification, the positive and negative current collecting members are directly connected to the end of the electrode body 20 in the winding axis A direction, but the present invention is not limited to this. The electrode body has a positive electrode tab and a negative electrode tab which are protruding pieces protruding from the positive electrode plate and the negative electrode plate at the end in the winding axis A direction, and the positive electrode tab and the negative electrode tab are respectively a positive electrode current collecting member and a negative electrode current collector. It may be connected to a member.

実施の形態及び変形例に係る蓄電素子では、電極体２０は、正極板、負極板及びセパレータを一緒に巻回して形成される巻回型の電極体であったが、これに限定されない。電極体は、多数の正極板、負極板及びセパレータを重ねて形成されるスタック型の電極体であってもよく、重ねた一組の、又は、二組以上の、正極板、負極板及びセパレータを複数回折り曲げて形成されるＺ型の電極体であってもよい。   In the electricity storage device according to the embodiment and the modification, the electrode body 20 is a wound electrode body formed by winding a positive electrode plate, a negative electrode plate, and a separator together, but is not limited thereto. The electrode body may be a stack type electrode body formed by stacking a large number of positive plates, negative plates and separators, and a set of two or more stacked positive plates, negative plates and separators. It may be a Z-shaped electrode body formed by bending a plurality of wires.

実施の形態及び変形例に係る蓄電素子は、容器１０内に１つの電極体２０を備えていたが、２つ以上の電極体を備える構成を有してもよい。   The power storage element according to the embodiment and the modification includes one electrode body 20 in the container 10, but may have a configuration including two or more electrode bodies.

また、実施の形態及び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。また、本発明は、上述のような蓄電素子だけでなく、１つ以上の蓄電素子を備える蓄電装置も含み得る。例えば、蓄電装置は、複数の蓄電素子１００を備える装置として実現することができる。蓄電装置は、並べて配置された複数の蓄電ユニットを備え、各蓄電ユニットは、例えば一列に並べられ且つ互いに電気的に接続された複数の蓄電素子１００によって、構成される。上述の構成によって、複数の蓄電素子１００が、１ユニットとして使用され、蓄電装置に必要な電気容量、蓄電装置の形状及び寸法等に対応して、蓄電ユニットの数量及び配列が選択され得る。複数の蓄電素子１００を備え且つ高出力である蓄電装置は、電気自動車（ＥＶ）、ハイブリッド自動車（ＨＥＶ）、プラグインハイブリッド自動車（ＰＨＥＶ）、無人搬送車（ＡＧＶ）等の車両用電源として搭載することもできる。   In addition, embodiments constructed by arbitrarily combining the embodiment and the modified examples are also included in the scope of the present invention. In addition, the present invention can include not only the above-described power storage element but also a power storage device including one or more power storage elements. For example, the power storage device can be realized as a device including a plurality of power storage elements 100. The power storage device includes a plurality of power storage units arranged side by side, and each power storage unit includes, for example, a plurality of power storage elements 100 arranged in a line and electrically connected to each other. With the above-described configuration, the plurality of power storage elements 100 are used as one unit, and the quantity and arrangement of the power storage units can be selected in accordance with the electric capacity required for the power storage device, the shape and dimensions of the power storage device, and the like. A power storage device including a plurality of power storage elements 100 and having a high output is mounted as a power source for vehicles such as an electric vehicle (EV), a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHEV), and an automatic guided vehicle (AGV). You can also.

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 容器
１２ 蓋体（壁部）
２０ 電極体
４１ 負極端子（第一の導電部材）
４１ｂａ，４４ｃａｂ，４５ｃ，４５ｄ 凸部
４４，２４４ 負極集電部材（第二の導電部材）
４４ｃ 軸部
４４ｃａ かしめ突出部（固定部、塑性変形部）
４５ 封止部材（第一封止部材）
４６ 第二封止部材
４７ 軸部材（第二の導電部材）
４７ａ フランジ部（固定部）
１００ 蓄電素子 10 Container 12 Lid (wall)
20 Electrode body 41 Negative electrode terminal (first conductive member)
41ba, 44cab, 45c, 45d Convex portion 44, 244 Negative electrode current collecting member (second conductive member)
44c Shaft portion 44ca Caulking projection (fixed portion, plastic deformation portion)
45 Sealing member (first sealing member)
46 Second sealing member 47 Shaft member (second conductive member)
47a Flange (fixed part)
100 Power storage element

Claims (11)

電極体と、
前記電極体を収容する容器と、
第一の導電部材と、
前記電極体と電気的に接続され且つ前記第一の導電部材と接続される第二の導電部材であって、前記容器の壁部を貫通して配置される第二の導電部材と、
前記第一の導電部材と前記第二の導電部材との間に配置される非金属の封止部材とを備え、
前記第一の導電部材と前記第二の導電部材とは、直接接触し、
前記第一の導電部材及び前記第二の導電部材は、互いに異なる金属材料で構成され、
前記封止部材は、前記第一の導電部材及び前記第二の導電部材の接触界面に配置される
蓄電素子。 An electrode body;
A container for housing the electrode body;
A first conductive member;
A second conductive member electrically connected to the electrode body and connected to the first conductive member, wherein the second conductive member is disposed through the wall of the container;
A non-metallic sealing member disposed between the first conductive member and the second conductive member;
The first conductive member and the second conductive member are in direct contact,
The first conductive member and the second conductive member are made of different metal materials,
The sealing member is disposed at a contact interface between the first conductive member and the second conductive member. 前記封止部材は、前記第一の導電部材及び前記第二の導電部材の接触界面の端部に配置される
請求項１に記載の蓄電素子。 The storage element according to claim 1, wherein the sealing member is disposed at an end portion of a contact interface between the first conductive member and the second conductive member. 前記第二の導電部材は、前記壁部を貫通する軸部と、前記軸部を前記壁部に固定する固定部とを含む
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 second conductive member includes a shaft portion that penetrates the wall portion, and a fixing portion that fixes the shaft portion to the wall portion. 前記固定部は、前記軸部の端部の塑性変形部によって構成される
請求項３に記載の蓄電素子。 The electric storage element according to claim 3, wherein the fixing portion is configured by a plastic deformation portion at an end portion of the shaft portion. 前記封止部材は、前記第一の導電部材及び前記固定部が前記軸部の軸方向で隣接する部分に配置される第一の封止部材である
請求項３または４に記載の蓄電素子。 5. The power storage device according to claim 3, wherein the sealing member is a first sealing member in which the first conductive member and the fixing portion are disposed in a portion adjacent to the shaft portion in the axial direction. 前記封止部材は、前記第一の導電部材及び前記軸部が隣接する部分に配置される第二の封止部材である
請求項３または４に記載の蓄電素子。 The power storage device according to claim 3 or 4, wherein the sealing member is a second sealing member disposed in a portion where the first conductive member and the shaft portion are adjacent to each other. 前記固定部は、前記軸部の軸方向で前記第一の導電部材よりも突出する
請求項３〜６のいずれか一項に記載の蓄電素子。 The power storage element according to any one of claims 3 to 6, wherein the fixed portion protrudes from the first conductive member in an axial direction of the shaft portion. 前記固定部は、前記軸部の軸方向で前記第一の導電部材よりも窪んで位置する
請求項３〜６のいずれか一項に記載の蓄電素子。 The power storage element according to any one of claims 3 to 6, wherein the fixing portion is positioned to be recessed from the first conductive member in an axial direction of the shaft portion. 前記封止部材の硬度は、前記第一の導電部材の硬度及び前記第二の導電部材の硬度よりも低い
請求項１〜８のいずれか一項に記載の蓄電素子。 The power storage device according to any one of claims 1 to 8, wherein the hardness of the sealing member is lower than the hardness of the first conductive member and the hardness of the second conductive member. 前記封止部材は、前記第一の導電部材及び前記第二の導電部材の少なくとも一方に向かって突出する凸部を含む
請求項１〜９のいずれか一項に記載の蓄電素子。 The power storage device according to any one of claims 1 to 9, wherein the sealing member includes a protrusion that protrudes toward at least one of the first conductive member and the second conductive member. 前記第一の導電部材及び前記第二の導電部材の少なくとも一方は、前記封止部材に向かって突出する凸部を含む
請求項１〜１０のいずれか一項に記載の蓄電素子。 The power storage device according to any one of claims 1 to 10, wherein at least one of the first conductive member and the second conductive member includes a protrusion protruding toward the sealing member.
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