JP2017045717A - Energy storage element - Google Patents

Energy storage element Download PDF

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Publication number
JP2017045717A
JP2017045717A JP2016121233A JP2016121233A JP2017045717A JP 2017045717 A JP2017045717 A JP 2017045717A JP 2016121233 A JP2016121233 A JP 2016121233A JP 2016121233 A JP2016121233 A JP 2016121233A JP 2017045717 A JP2017045717 A JP 2017045717A
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fixing member
conductive member
current collector
positive electrode
terminal
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JP6740739B2 (en
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良太 道畑
Ryota Michihata
良太 道畑
隆弘 志築
Takahiro Shizuki
隆弘 志築
直樹 太田
Naoki Ota
直樹 太田
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GS Yuasa Corp
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GS Yuasa Corp
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Priority to US15/231,536 priority Critical patent/US10269502B2/en
Priority to CN201610694487.7A priority patent/CN106486635A/en
Priority to DE102016215681.0A priority patent/DE102016215681A1/en
Publication of JP2017045717A publication Critical patent/JP2017045717A/en
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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • 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

Abstract

PROBLEM TO BE SOLVED: To provide an energy storage element which can maintain energy storage performance for a long period by suppressing loosening of a conductive member.SOLUTION: An energy storage element 10 includes: a container 100; a terminal (positive electrode terminal 200) disposed outside the container 100 or a current collector (positive electrode current collector 120) disposed inside the container 100; a conductive member 300 penetrating the container 100 and connected to the current collector or the terminal; and a fixing member (first fixing member 600, second fixing member 800) joining the current collector or the terminal and the conductive member 300 to each other.SELECTED DRAWING: Figure 3

Description

本発明は、蓄電素子に関する。   The present invention relates to a power storage element.

外部に設けられた端子と容器の内方に配置された集電体とが導電部材によって接続された蓄電素子が知られている。そして、端子又は集電体と導電部材とを溶接することによって、端子又は集電体と導電部材との接続強度が確保されている（例えば特許文献１参照）。   A power storage element is known in which a terminal provided outside and a current collector disposed inside a container are connected by a conductive member. And the connection intensity | strength of a terminal or a collector and a conductive member is ensured by welding a terminal or a collector and a conductive member (for example, refer patent document 1).

特開２０１２−２８２４６号公報JP 2012-28246 A

しかしながら、端子又は集電体と導電部材とを直接溶接する際には、導電部材のかしめられた部分、つまり湾曲した部分を溶接することになり、溶接個所の形状が不安定であることから溶接が確実に行えない可能性があった。溶接が不安定であると、振動や衝撃によって、端子又は集電体と導電部材との間に緩みが生じるおそれがある。この緩みは、電気抵抗の増加を誘発させてしまい、蓄電素子の蓄電性能を十分発揮できない。   However, when the terminal or current collector is directly welded to the conductive member, the caulked portion of the conductive member, that is, the curved portion is welded, and the shape of the welding point is unstable. There was a possibility that could not be performed reliably. If welding is unstable, loosening may occur between the terminal or current collector and the conductive member due to vibration or impact. This loosening induces an increase in electrical resistance, and the power storage performance of the power storage element cannot be fully exhibited.

本発明は、上記問題を解決するためになされたものであり、端子又は集電体と導電部材との間の緩みを抑制することで、長期的に蓄電性能を維持することのできる蓄電素子を提供することを目的とする。   The present invention has been made in order to solve the above-described problem, and an electrical storage element capable of maintaining electrical storage performance in the long term by suppressing loosening between a terminal or current collector and a conductive member. The purpose is to provide.

上記目的を達成するために、本発明の一態様に係る蓄電素子は、容器と、容器の外方に配置された端子、又は、容器の内方に配置された集電体と、容器を貫通し、かつ、集電体又は端子と接続される導電部材と、集電体又は端子と導電部材とを接合する固定部材と、を備える。   In order to achieve the above object, a power storage element according to one embodiment of the present invention includes a container, a terminal disposed outside the container, a current collector disposed inside the container, and a container penetrating the container. And a conductive member connected to the current collector or the terminal, and a fixing member that joins the current collector or the terminal and the conductive member.

本発明によれば、固定部材を用いることで、集電体又は端子と導電部材との間の緩みを抑制することができ、長期的に蓄電性能を維持することが可能となる。   According to the present invention, by using the fixing member, loosening between the current collector or the terminal and the conductive member can be suppressed, and the power storage performance can be maintained for a long time.

本発明の実施の形態に係る蓄電素子の外観を模式的に示す斜視図である。It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment of this invention. 本発明の実施の形態に係る蓄電素子の容器の容器本体を分離して蓄電素子が備える各構成要素を示す斜視図である。It is a perspective view which shows each component with which the container main body of the container of the electrical storage element which concerns on embodiment of this invention isolate | separates, and an electrical storage element is provided. 本発明の実施の形態に係る正極端子及び負極端子が正極集電体及び負極集電体とともに蓋体に固定される構成を示す断面図である。It is sectional drawing which shows the structure by which the positive electrode terminal and negative electrode terminal which concern on embodiment of this invention are fixed to a cover body with a positive electrode collector and a negative electrode collector. 本発明の実施の形態に係る蓄電素子の正極端子周りの構成を分解した場合の各構成要素を示す分解図である。It is an exploded view which shows each component at the time of decomposing | disassembling the structure around the positive electrode terminal of the electrical storage element which concerns on embodiment of this invention. 本発明の実施の形態に係る正極端子が正極集電体とともに蓋体に固定された構成を示す断面図である。It is sectional drawing which shows the structure by which the positive electrode terminal which concerns on embodiment of this invention was fixed to the cover body with the positive electrode electrical power collector. 本実施の形態に係る第一固定部材の概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the 1st fixing member which concerns on this Embodiment. 本実施の形態に係る第一固定部材の平面視図である。It is a top view of the 1st fixing member concerning this embodiment. 本実施の形態の変形例１に係る導電部材、第一固定部材及び第二固定部材の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the electrically-conductive member which concerns on the modification 1 of this Embodiment, a 1st fixing member, and a 2nd fixing member. 本実施の形態の変形例２に係る導電部材、第一固定部材の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the electrically-conductive member which concerns on the modification 2 of this Embodiment, and a 1st fixing member. 本実施の形態の変形例２に係る導電部材、第二固定部材の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the electrically-conductive member which concerns on the modification 2 of this Embodiment, and a 2nd fixing member. 本実施の形態の変形例３に係る第一固定部材の概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the 1st fixing member which concerns on the modification 3 of this Embodiment. 本実施の形態の変形例４に係る第一固定部材の概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the 1st fixing member which concerns on the modification 4 of this Embodiment. 本実施の形態の変形例４に係る導電部材、第一固定部材及び第二固定部材の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the electrically-conductive member which concerns on the modification 4 of this Embodiment, a 1st fixing member, and a 2nd fixing member. 本実施の形態の変形例５に係る導電部材、第一固定部材及び第二固定部材の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the electrically-conductive member which concerns on the modification 5 of this Embodiment, a 1st fixing member, and a 2nd fixing member.

以下、図面を参照しながら、本発明の実施の形態に係る蓄電素子について説明する。なお、以下で説明する実施の形態は、いずれも本発明の好ましい一具体例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、製造工程、製造工程の順序などは、一例であり、本発明を限定する主旨ではない。また、以下の実施の形態における構成要素のうち、最上位概念を示す独立請求項に記載されていない構成要素については、任意の構成要素として説明される。   Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, manufacturing steps, order of manufacturing steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

（実施の形態）
まず、蓄電素子１０の構成について、説明する。図１は、本発明の実施の形態に係る蓄電素子１０の外観を模式的に示す斜視図である。図２は、本発明の実施の形態に係る蓄電素子１０の容器１００の容器本体１１１を分離して蓄電素子１０が備える各構成要素を示す斜視図である。なお、これらの図では、Ｚ軸方向を上下方向として示しており、以下ではＺ軸方向を上下方向として説明する場合があるが、使用態様によってはＺ軸方向が上下方向にならない場合も考えられるため、Ｚ軸方向は上下方向となることには限定されない。以降の図においても、同様である。 (Embodiment)
First, the configuration of the power storage element 10 will be described. FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing components included in power storage element 10 by separating container body 111 of container 100 of power storage element 10 according to the embodiment of the present invention. In these drawings, the Z-axis direction is shown as the up-down direction, and in the following description, the Z-axis direction may be described as the up-down direction. For this reason, the Z-axis direction is not limited to the vertical direction. The same applies to the subsequent drawings.

蓄電素子１０は、電気を充電し、また、電気を放電することのできる二次電池であり、より具体的には、リチウムイオン二次電池などの非水電解質二次電池である。なお、蓄電素子１０は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。   The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

図１及び図２に示すように、蓄電素子１０は、容器１００と、正極端子２００及び負極端子２０１と、正極集電体１２０及び負極集電体１３０と、導電部材３００及び３０１と、第一固定部材６００及び６０１と、第二固定部材８００及び８０１（図３参照）と、電極体１４０とを備えている。   As shown in FIGS. 1 and 2, the storage element 10 includes a container 100, a positive electrode terminal 200 and a negative electrode terminal 201, a positive electrode current collector 120 and a negative electrode current collector 130, conductive members 300 and 301, The fixing members 600 and 601, the second fixing members 800 and 801 (see FIG. 3), and the electrode body 140 are provided.

また、蓄電素子１０の容器１００の内部には電解液（非水電解質）などの液体が封入されているが、当該液体の図示は省略する。なお、容器１００に封入される電解液としては、蓄電素子１０の性能を損なうものでなければその種類に特に制限はなく様々なものを選択することができる。   In addition, a liquid such as an electrolytic solution (non-aqueous electrolyte) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. In addition, as long as it does not impair the performance of the electrical storage element 10, as the electrolyte solution enclosed with the container 100, there is no restriction | limiting in particular and various things can be selected.

容器１００は、矩形筒状で底を備える容器本体１１１と、容器本体１１１の開口を閉塞する板状部材である蓋体１１０とで構成されている。また、容器１００は、正極集電体１２０、負極集電体１３０及び電極体１４０等を内部に収容後、蓋体１１０と容器本体１１１とが溶接等されることにより、内部を密封することができるものとなっている。なお、蓋体１１０及び容器本体１１１の材質は、特に限定されないが、例えばステンレス鋼、アルミニウム、アルミニウム合金、鉄、メッキ鋼板など溶接可能な金属であるのが好ましい。   The container 100 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid body 110 that is a plate-like member that closes the opening of the container body 111. In addition, the container 100 can be sealed by welding the lid body 110 and the container body 111 after the positive electrode current collector 120, the negative electrode current collector 130, the electrode body 140, and the like are accommodated therein. It is possible. The material of the lid 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate.

電極体１４０は、正極と負極とセパレータとを備え、電気を蓄えることができる部材である。正極は、アルミニウムやアルミニウム合金などからなる長尺帯状の金属箔である正極基材箔上に正極活物質層が形成されたものである。また、負極は、銅や銅合金などからなる長尺帯状の金属箔である負極基材箔上に負極活物質層が形成されたものである。また、セパレータは、樹脂からなる微多孔性のシートである。ここで、正極活物質層に用いられる正極活物質、または負極活物質層に用いられる負極活物質としては、リチウムイオンを吸蔵放出可能な正極活物質または負極活物質であれば、適宜公知の材料を使用できる。   The electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity. In the positive electrode, a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip-shaped metal foil made of aluminum or an aluminum alloy. The negative electrode is obtained by forming a negative electrode active material layer on a negative electrode substrate foil, which is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of resin. Here, the positive electrode active material used for the positive electrode active material layer or the negative electrode active material used for the negative electrode active material layer may be a known material as long as it is a positive electrode active material or a negative electrode active material capable of occluding and releasing lithium ions. Can be used.

そして、電極体１４０は、負極と正極との間にセパレータが挟み込まれるように層状に配置されたものが巻き回されて形成され、正極集電体１２０及び負極集電体１３０と電気的に接続されている。なお、図２では、電極体１４０として断面が長円形状のものを示したが、円形状または楕円形状でもよい。また、電極体１４０の形状は巻回型に限らず、平板状極板を積層した積層型であってもよい。   The electrode body 140 is formed by winding a layered arrangement so that a separator is sandwiched between the negative electrode and the positive electrode, and is electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130. Has been. In FIG. 2, the electrode body 140 has an oval cross section, but may be circular or elliptical. Further, the shape of the electrode body 140 is not limited to the wound type, and may be a laminated type in which flat plate plates are laminated.

正極端子２００は、容器１００の外方に配置され、電極体１４０の正極に電気的に接続された端子である。また、負極端子２０１は、容器１００の外方に配置され、電極体１４０の負極に電気的に接続された端子である。つまり、正極端子２００及び負極端子２０１は、電極体１４０に蓄えられている電気を蓄電素子１０の外部空間に導出し、また、電極体１４０に電気を蓄えるために蓄電素子１０の内部空間に電気を導入するための導電性の電極端子である。   The positive electrode terminal 200 is a terminal disposed outside the container 100 and electrically connected to the positive electrode of the electrode body 140. The negative electrode terminal 201 is a terminal that is disposed outside the container 100 and is electrically connected to the negative electrode of the electrode body 140. In other words, the positive electrode terminal 200 and the negative electrode terminal 201 lead the electricity stored in the electrode body 140 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 140, It is a conductive electrode terminal for introducing.

また、正極端子２００及び負極端子２０１は、電極体１４０の上方に配置された蓋体１１０に取り付けられている。具体的には、正極端子２００は、導電部材３００によって、正極集電体１２０とともに蓋体１１０に固定される。また同様に、負極端子２０１は、導電部材３０１によって、負極集電体１３０とともに蓋体１１０に固定される。なお、正極端子２００及び負極端子２０１が正極集電体１２０及び負極集電体１３０とともに蓋体１１０に固定される詳細な構成については、後述する。   The positive electrode terminal 200 and the negative electrode terminal 201 are attached to the lid body 110 disposed above the electrode body 140. Specifically, the positive electrode terminal 200 is fixed to the lid 110 together with the positive electrode current collector 120 by the conductive member 300. Similarly, the negative electrode terminal 201 is fixed to the lid 110 together with the negative electrode current collector 130 by the conductive member 301. A detailed configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 are fixed to the lid 110 together with the positive electrode current collector 120 and the negative electrode current collector 130 will be described later.

正極集電体１２０及び負極集電体１３０は、容器１００の内方、つまり、蓋体１１０の内表面（Ｚ軸方向マイナス側の面）に配置される。具体的には、正極集電体１２０は、電極体１４０の正極と容器本体１１１の側壁との間に配置され、正極端子２００と電極体１４０の正極とに電気的に接続される導電性と剛性とを備えた集電体である。負極集電体１３０は、電極体１４０の負極と容器本体１１１の側壁との間に配置され、負極端子２０１と電極体１４０の負極とに電気的に接続される導電性と剛性とを備えた集電体である。なお、正極集電体１２０は、電極体１４０の正極基材箔と同様、アルミニウムまたはアルミニウム合金などで形成されている。また、負極集電体１３０は、電極体１４０の負極基材箔と同様、銅または銅合金などで形成されている。   The positive electrode current collector 120 and the negative electrode current collector 130 are disposed on the inner side of the container 100, that is, on the inner surface (the surface on the negative side in the Z-axis direction) of the lid 110. Specifically, the positive electrode current collector 120 is disposed between the positive electrode of the electrode body 140 and the side wall of the container body 111, and is electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 140. It is a current collector with rigidity. The negative electrode current collector 130 is disposed between the negative electrode of the electrode body 140 and the side wall of the container body 111, and has conductivity and rigidity electrically connected to the negative electrode terminal 201 and the negative electrode of the electrode body 140. It is a current collector. The positive electrode current collector 120 is formed of aluminum, an aluminum alloy, or the like, like the positive electrode base material foil of the electrode body 140. In addition, the negative electrode current collector 130 is formed of copper, a copper alloy, or the like, like the negative electrode base foil of the electrode body 140.

導電部材３００は、正極端子２００と正極集電体１２０とを接続する部材である。また、導電部材３０１は、負極端子２０１と負極集電体１３０とを接続する部材である。具体的には、導電部材３００は、正極端子２００と正極集電体１２０とを蓋体１１０に固定して接続し、導電部材３０１は、負極端子２０１と負極集電体１３０とを蓋体１１０に固定して接続する。また、導電部材３００及び３０１は、金属などの導電性の部材で形成されている。なお、導電部材３００は、正極集電体１２０及び電極体１４０の正極基材箔と同様、アルミニウムまたはアルミニウム合金などで形成されているのがよい。また、導電部材３０１は、負極集電体１３０及び電極体１４０の負極基材箔と同様、銅または銅合金などで形成されているのがよい。   The conductive member 300 is a member that connects the positive electrode terminal 200 and the positive electrode current collector 120. The conductive member 301 is a member that connects the negative electrode terminal 201 and the negative electrode current collector 130. Specifically, the conductive member 300 fixes and connects the positive electrode terminal 200 and the positive electrode current collector 120 to the lid body 110, and the conductive member 301 connects the negative electrode terminal 201 and the negative electrode current collector 130 to the lid body 110. Securely connect to. The conductive members 300 and 301 are formed of a conductive member such as metal. Note that the conductive member 300 is preferably made of aluminum or an aluminum alloy, like the positive electrode base foil of the positive electrode current collector 120 and the electrode body 140. In addition, the conductive member 301 is preferably formed of copper or a copper alloy as in the negative electrode base foil of the negative electrode current collector 130 and the electrode body 140.

第一固定部材６００は、導電部材３００と、正極端子２００とを接合して固定する部材である。また、第一固定部材６０１は、導電部材３０１と、負極端子２０１とを接合して固定する部材である。第二固定部材８００（図３参照）は、導電部材３００と、正極集電体１２０とを固定する部材である。また、第二固定部材８０１は、導電部材３０１と、負極集電体１３０とを固定する部材である。   The first fixing member 600 is a member that joins and fixes the conductive member 300 and the positive electrode terminal 200. The first fixing member 601 is a member that joins and fixes the conductive member 301 and the negative electrode terminal 201. The second fixing member 800 (see FIG. 3) is a member that fixes the conductive member 300 and the positive electrode current collector 120. The second fixing member 801 is a member that fixes the conductive member 301 and the negative electrode current collector 130.

第一固定部材６００及び６０１と、第二固定部材８００及び８０１とは、金属などの導電性の部材で形成されている。なお、第一固定部材６００及び第二固定部材８００は、正極集電体１２０及び電極体１４０の正極基材箔と同様、アルミニウムまたはアルミニウム合金などで形成されているのがよい。また、第一固定部材６０１及び第二固定部材８０１は、負極集電体１３０及び電極体１４０の負極基材箔と同様、銅または銅合金などで形成されているのがよい。   The first fixing members 600 and 601 and the second fixing members 800 and 801 are formed of a conductive member such as metal. In addition, the 1st fixing member 600 and the 2nd fixing member 800 are good to be formed with aluminum or aluminum alloy etc. like the positive electrode base material foil of the positive electrode collector 120 and the electrode body 140. FIG. Moreover, the 1st fixing member 601 and the 2nd fixing member 801 are good to be formed with copper or a copper alloy etc. like the negative electrode base material foil of the negative electrode collector 130 and the electrode body 140. FIG.

次に、正極端子２００及び負極端子２０１が、導電部材３００及び３０１によって、正極集電体１２０及び負極集電体１３０とともに蓋体１１０に固定される構成について、説明する。まず、当該構成の概要について説明する。なお、正極端子２００側の構成と負極端子２０１側の構成とは、同様の構成を有するため、以下では正極端子２００側の構成についての説明を中心に行い、負極端子２０１側の構成についての説明は、省略または簡略化する。   Next, a configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 are fixed to the lid 110 together with the positive electrode current collector 120 and the negative electrode current collector 130 by the conductive members 300 and 301 will be described. First, an outline of the configuration will be described. Since the configuration on the positive electrode terminal 200 side and the configuration on the negative electrode terminal 201 side have the same configuration, the following description focuses on the configuration on the positive electrode terminal 200 side, and the configuration on the negative electrode terminal 201 side. Are omitted or simplified.

図３は、本発明の実施の形態に係る正極端子２００及び負極端子２０１が正極集電体１２０及び負極集電体１３０とともに蓋体１１０に固定される構成を示す断面図である。具体的には、図３は、図２に示された蓄電素子１０を、ＩＩＩ−ＩＩＩ線を含むＸＺ平面に平行な面で切断した場合の正極端子２００及び負極端子２０１周りの構成を示す断面図である。   FIG. 3 is a cross-sectional view showing a configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 according to the embodiment of the present invention are fixed to the lid body 110 together with the positive electrode current collector 120 and the negative electrode current collector 130. Specifically, FIG. 3 is a cross-sectional view showing a configuration around the positive electrode terminal 200 and the negative electrode terminal 201 when the power storage device 10 shown in FIG. 2 is cut along a plane parallel to the XZ plane including the III-III line. FIG.

図３に示すように、蓄電素子１０は、正極端子２００及び正極集電体１２０側において、さらに、第一封止部材４００と第二封止部材５００とを備えており、正極端子２００は、連結部２１０と接続ボルト２２０とを有している。また、正極集電体１２０は、正極端子２００と導電部材３００を介して接続される平板状の端子側配置部１２１と、電極体１４０と接合される２本の電極体接続部１２２とを有している。   As shown in FIG. 3, the power storage element 10 further includes a first sealing member 400 and a second sealing member 500 on the positive electrode terminal 200 and positive electrode current collector 120 side. It has a connecting part 210 and a connecting bolt 220. The positive electrode current collector 120 has a flat terminal-side arrangement portion 121 connected to the positive electrode terminal 200 via the conductive member 300 and two electrode body connection portions 122 joined to the electrode body 140. doing.

正極端子２００の連結部２１０は、容器１００の外方に配置される電極端子の本体部分である。つまり、連結部２１０は、正極端子２００の本体部分であり、蓋体１１０の上方（Ｚ軸方向プラス側）に配置される。連結部２１０は、金属（例えば、アルミニウム）などの導電性の部材で形成されている。   The connecting portion 210 of the positive electrode terminal 200 is a main body portion of the electrode terminal disposed outside the container 100. That is, the connecting portion 210 is a main body portion of the positive electrode terminal 200 and is disposed above the lid body 110 (Z-axis direction plus side). The connecting portion 210 is formed of a conductive member such as a metal (for example, aluminum).

連結部２１０は、導電部材３００によって、正極集電体１２０の端子側配置部１２１とともに、蓋体１１０に固定される。接続ボルト２２０は、連結部２１０の第一開口部２１２（図４参照）から容器１００の外方に突出して配置されたボルト形状の部材であり、蓄電素子１０の電極端子間を繋ぐバスバー（図示せず）に接続される。接続ボルト２２０は、金属（例えば、アルミニウムやステンレス）などの導電性の部材で形成されている。   The connecting portion 210 is fixed to the lid 110 together with the terminal-side arrangement portion 121 of the positive electrode current collector 120 by the conductive member 300. The connection bolt 220 is a bolt-shaped member disposed so as to protrude from the first opening 212 (see FIG. 4) of the connecting portion 210 to the outside of the container 100, and is a bus bar that connects between the electrode terminals of the electricity storage device 10 (FIG. (Not shown). The connection bolt 220 is formed of a conductive member such as metal (for example, aluminum or stainless steel).

第一封止部材４００は、正極端子２００と蓋体１１０との間に少なくともその一部が配置されるパッキンである。第一封止部材４００は、蓋体１１０よりも剛性が低く、かつ、絶縁性の部材で形成されているのが好ましく、例えば、ポリフェニレンサルファイド（ＰＰＳ）やポリプロピレン（ＰＰ）などの樹脂で形成されている。   The first sealing member 400 is a packing in which at least a part thereof is disposed between the positive electrode terminal 200 and the lid body 110. The first sealing member 400 is preferably made of an insulating member having lower rigidity than the lid 110, and is made of, for example, a resin such as polyphenylene sulfide (PPS) or polypropylene (PP). ing.

第二封止部材５００は、正極集電体１２０の端子側配置部１２１と蓋体１１０との間に少なくともその一部が配置されるパッキンである。第二封止部材５００は、蓋体１１０よりも剛性が低く、かつ、絶縁性の部材で形成されているのが好ましく、例えば、ポリフェニレンサルファイド（ＰＰＳ）やポリプロピレン（ＰＰ）などの樹脂で形成されている。   The second sealing member 500 is a packing in which at least part of the second sealing member 500 is disposed between the terminal-side arrangement portion 121 of the positive electrode current collector 120 and the lid body 110. The second sealing member 500 is preferably made of an insulating member having a lower rigidity than the lid 110 and is made of a resin such as polyphenylene sulfide (PPS) or polypropylene (PP). ing.

第一固定部材６００は、正極端子２００側の導電部材３００を容器１００の外方から覆って、正極端子２００の連結部２１０に固定されている。   The first fixing member 600 covers the conductive member 300 on the positive electrode terminal 200 side from the outside of the container 100 and is fixed to the connecting portion 210 of the positive electrode terminal 200.

第二固定部材８００は、正極端子２００側の導電部材３００を容器１００の内方から覆って、正極集電体１２０の端子側配置部１２１に固定されている。   The second fixing member 800 covers the conductive member 300 on the positive electrode terminal 200 side from the inside of the container 100 and is fixed to the terminal side arrangement portion 121 of the positive electrode current collector 120.

次に、正極端子２００が、導電部材３００によって、正極集電体１２０とともに蓋体１１０に固定される構成の詳細について、説明する。なお、正極端子２００側の構成と負極端子２０１側の構成とは、同様の構成を有するため、以下では正極端子２００側の構成についての説明を中心に行い、負極端子２０１側の構成についての説明は、省略または簡略化する。   Next, details of a configuration in which the positive electrode terminal 200 is fixed to the lid 110 together with the positive electrode current collector 120 by the conductive member 300 will be described. Since the configuration on the positive electrode terminal 200 side and the configuration on the negative electrode terminal 201 side have the same configuration, the following description focuses on the configuration on the positive electrode terminal 200 side, and the configuration on the negative electrode terminal 201 side. Are omitted or simplified.

図５は、本発明の実施の形態に係る正極端子２００が正極集電体１２０とともに蓋体１１０に固定された構成を示す断面図である。具体的には、図５は、図３に示された正極端子２００周りの構成を拡大して示す拡大断面図である。   FIG. 5 is a cross-sectional view illustrating a configuration in which the positive electrode terminal 200 according to the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120. Specifically, FIG. 5 is an enlarged cross-sectional view showing an enlarged configuration around the positive electrode terminal 200 shown in FIG.

図５に示すように、第一封止部材４００において、板状部４１０は、正極端子２００の連結部２１０及び導電部材３００のフランジ部３２０と、蓋体１１０との間に配置されている。また、板状部４１０は、蓋体１１０に接して配置されている。なお、板状部４１０は、連結部２１０及びフランジ部３２０のうちの少なくとも一方と、蓋体１１０との間に配置されていればよい。   As shown in FIG. 5, in the first sealing member 400, the plate-like portion 410 is disposed between the connecting portion 210 of the positive electrode terminal 200 and the flange portion 320 of the conductive member 300 and the lid 110. Further, the plate-like portion 410 is disposed in contact with the lid 110. In addition, the plate-shaped part 410 should just be arrange | positioned between at least one of the connection part 210 and the flange part 320, and the cover body 110. FIG.

また、筒状部４２０は、蓋体１１０及び第二封止部材５００を貫通し、かつ、導電部材３００の周囲に配置されている。また、第二封止部材５００は、正極集電体１２０の端子側配置部１２１と蓋体１１０との間に配置されている。また、第二封止部材５００は、蓋体１１０に接して配置されている。   In addition, the cylindrical portion 420 passes through the lid 110 and the second sealing member 500 and is disposed around the conductive member 300. Further, the second sealing member 500 is disposed between the terminal-side arrangement portion 121 of the positive electrode current collector 120 and the lid 110. Further, the second sealing member 500 is disposed in contact with the lid 110.

導電部材３００は、柱部３１０が、連結部２１０と、蓋体１１０と、第一封止部材４００と、第二封止部材５００と、正極集電体１２０の端子側配置部１２１とを貫通して配置されている。また、導電部材３００は、連結部２１０と正極集電体１２０の端子側配置部１２１との間に、蓋体１１０を挟んで第一封止部材４００と第二封止部材５００とを配置して、連結部２１０と端子側配置部１２１とを挟み込むことで、連結部２１０と正極集電体１２０とを蓋体１１０に固定している。   In the conductive member 300, the column part 310 penetrates the connecting part 210, the lid body 110, the first sealing member 400, the second sealing member 500, and the terminal side arrangement part 121 of the positive electrode current collector 120. Are arranged. In the conductive member 300, the first sealing member 400 and the second sealing member 500 are arranged between the connecting portion 210 and the terminal side arrangement portion 121 of the positive electrode current collector 120 with the lid 110 interposed therebetween. Thus, the connecting part 210 and the positive electrode current collector 120 are fixed to the lid 110 by sandwiching the connecting part 210 and the terminal side arrangement part 121.

連結部２１０と端子側配置部１２１とは、第一封止部材４００と蓋体１１０と第二封止部材５００とを挟み込んだ状態で、導電部材３００としてのリベットによりかしめられて、蓋体１１０に固定されている。この際、導電部材３００は、上部と下部とがかしめられることで、柱部３１０の上部の空間３１１及び下部の空間３１２が外方に広げられ、また、柱部３１０の上端部及び下端部が外方に広がるように押圧されて、第一突出部３３０及び第二突出部３４０が形成されている。   The connection part 210 and the terminal side arrangement part 121 are caulked by a rivet as the conductive member 300 with the first sealing member 400, the lid body 110, and the second sealing member 500 sandwiched therebetween, and the lid body 110. It is fixed to. At this time, the upper and lower portions of the conductive member 300 are caulked, so that the upper space 311 and the lower space 312 of the column portion 310 are expanded outward, and the upper end portion and the lower end portion of the column portion 310 are The first protrusion 330 and the second protrusion 340 are formed by being pressed so as to spread outward.

つまり、第一突出部３３０及び第二突出部３４０は、かしめによって形成されたかしめ部であり、蓋体１１０を挟むように蓋体１１０に沿って突出して配置されている。具体的には、第一突出部３３０は、導電部材３００の正極端子２００側（Ｚ軸方向プラス側）の端部、つまり、容器１００の外方かつ連結部２１０の上方に配置された、環状のかしめ部である。また、第二突出部３４０は、導電部材３００の正極集電体１２０側（Ｚ軸方向マイナス側）の端部、つまり、容器１００の内方かつ端子側配置部１２１の下方に配置された、環状のかしめ部である。   That is, the first projecting portion 330 and the second projecting portion 340 are caulked portions formed by caulking, and are disposed so as to project along the lid body 110 so as to sandwich the lid body 110. Specifically, the first projecting portion 330 is an annular member disposed on the positive electrode terminal 200 side (Z-axis direction plus side) end of the conductive member 300, that is, on the outside of the container 100 and above the connecting portion 210. The caulking part. Further, the second protruding portion 340 is disposed at the end of the conductive member 300 on the positive electrode current collector 120 side (Z-axis direction negative side), that is, inside the container 100 and below the terminal side arrangement portion 121. An annular caulking portion.

この構成により、第一突出部３３０と蓋体１１０との間に、連結部２１０と第一封止部材４００とが配置され、固定されている。同様に、第二突出部３４０と蓋体１１０との間に、正極集電体１２０の端子側配置部１２１と第二封止部材５００とが配置され、固定されている。   With this configuration, the connecting portion 210 and the first sealing member 400 are disposed and fixed between the first protruding portion 330 and the lid 110. Similarly, the terminal side arrangement part 121 and the second sealing member 500 of the positive electrode current collector 120 are arranged and fixed between the second protrusion 340 and the lid 110.

第一固定部材６００は、導電部材３００の第一突出部３３０を容器１００の外方から覆って第一突出部３３０に当接した状態で、連結部２１０の平坦部に固定されている。第二固定部材８００は、導電部材３００の第二突出部３４０を容器１００の内方から覆って第二突出部３４０に当接した状態で、正極集電体１２０の端子側配置部１２１の平坦部に固定されている。これにより、正極端子２００と正極集電体１２０とはそれぞれ導電部材３００と第一固定部材６００及び第二固定部材８００で接合されている。   The first fixing member 600 is fixed to the flat portion of the connecting portion 210 in a state where the first protruding portion 330 of the conductive member 300 is covered from the outside of the container 100 and is in contact with the first protruding portion 330. The second fixing member 800 covers the second projecting portion 340 of the conductive member 300 from the inside of the container 100 and is in contact with the second projecting portion 340, so that the terminal-side arrangement portion 121 of the positive electrode current collector 120 is flat. It is fixed to the part. Thereby, the positive electrode terminal 200 and the positive electrode current collector 120 are joined by the conductive member 300, the first fixing member 600, and the second fixing member 800, respectively.

次に、第一固定部材６００について詳細に説明する。なお、第一固定部材６００と、第二固定部材８００とは、固定対象が異なるものの、同様の構成を有するため、以下では第一固定部材６００についての説明を中心に行い、第二固定部材８００についての説明は、省略または簡略化する。   Next, the first fixing member 600 will be described in detail. Although the first fixing member 600 and the second fixing member 800 have the same configuration, although the objects to be fixed are different, the following description will focus on the first fixing member 600, and the second fixing member 800 will be described below. The description of is omitted or simplified.

図６は、本実施の形態に係る第一固定部材６００の概略構成を示す斜視図である。図７は、本実施の形態に係る第一固定部材６００の平面視図である。図６及び図７に示すように、第一固定部材６００は、板体である板金により平面視略矩形状に形成されており、カバー部６１０と、壁部６２０と、当接部６３０とを備える。   FIG. 6 is a perspective view showing a schematic configuration of the first fixing member 600 according to the present embodiment. FIG. 7 is a plan view of the first fixing member 600 according to the present embodiment. As shown in FIGS. 6 and 7, the first fixing member 600 is formed in a substantially rectangular shape in plan view by a sheet metal that is a plate body, and includes a cover portion 610, a wall portion 620, and a contact portion 630. Prepare.

カバー部６１０は、導電部材３００の第一突出部３３０を蓋体１１０の外方から覆う部位である。カバー部６１０は、平面視で略矩形状に形成されている。なお、カバー部６１０の一つの角部６１１は円弧状に形成されている。カバー部６１０は、第一突出部３３０の稜線３３０Ｌに当接している。   The cover part 610 is a part that covers the first protrusion 330 of the conductive member 300 from the outside of the lid 110. The cover part 610 is formed in a substantially rectangular shape in plan view. One corner portion 611 of the cover portion 610 is formed in an arc shape. The cover part 610 is in contact with the ridge line 330L of the first protrusion 330.

壁部６２０は、カバー部６１０の異なる二辺のそれぞれから連結部２１０に向けて折り曲げられた折り曲げ部である。具体的には、壁部６２０は、カバー部６１０における二辺に対して設けられている。なお、カバー部６１０における壁部６２０のない二辺においては、カバー部６１０と連結部２１０との間に隙間が形成されている。この隙間を介することで、カバー部６１０と第一突出部３３０との当接状態を視認することができ、組み立て時或いはメンテナンス時に容易に確認作業を行うことができる。   The wall portion 620 is a bent portion that is bent toward the connecting portion 210 from each of two different sides of the cover portion 610. Specifically, the wall portion 620 is provided for two sides of the cover portion 610. Note that a gap is formed between the cover portion 610 and the connecting portion 210 on two sides of the cover portion 610 where the wall portion 620 is not present. Through this gap, the contact state between the cover portion 610 and the first protrusion 330 can be visually confirmed, and the confirmation operation can be easily performed during assembly or maintenance.

当接部６３０は、カバー部６１０と平行となるように、壁部６２０の先端から外方に向けて折り曲げられた折り曲げ部であり、連結部２１０に面接触して固定されている。本実施の形態では、第一固定部材６００が、４つの折り曲げ部（２つの壁部６２０及び２つの当接部６３０）を備えている場合を例示して説明したが、第一固定部材は折り曲げ部を２つ以上備えていればよい。   The contact portion 630 is a bent portion that is bent outward from the tip of the wall portion 620 so as to be parallel to the cover portion 610, and is fixed in surface contact with the connecting portion 210. In the present embodiment, the case where the first fixing member 600 includes four bent portions (two wall portions 620 and two contact portions 630) has been described as an example, but the first fixing member is bent. What is necessary is just to provide two or more parts.

そして、第一固定部材６００は、カバー部６１０及び当接部６３０が溶接されることにより、第一突出部３３０及び連結部２１０に固定されている。具体的には、図６に示すように、カバー部６１０は、第一突出部３３０の稜線３３０Ｌに対応する部分Ｐ１０が４箇所、溶接されている。溶接としては、例えばレーザ溶接などが挙げられる。レーザ溶接の場合、図５の矢印Ｙ３に示す方向でレーザが照射される。このとき、カバー部６１０の平坦な部分に対してレーザを照射することができるので、容易で確実な溶接が可能である。   And the 1st fixing member 600 is being fixed to the 1st protrusion part 330 and the connection part 210 by welding the cover part 610 and the contact part 630. FIG. Specifically, as shown in FIG. 6, the cover portion 610 is welded with four portions P10 corresponding to the ridgeline 330L of the first projecting portion 330. Examples of welding include laser welding. In the case of laser welding, the laser is irradiated in the direction indicated by the arrow Y3 in FIG. At this time, since the laser can be applied to the flat portion of the cover portion 610, easy and reliable welding is possible.

また、図６に示すように、各当接部６３０は、縁辺６３１に対応する部分Ｐ３０が２箇所、溶接されている。これにより、第一固定部材６００の少なくとも異なる二辺が連結部２１０に溶接される。レーザ溶接の場合、図５の矢印Ｙ４に示す方向でレーザが照射される。このとき、全体として平坦な当接部６３０に対してレーザを照射することができるので、容易で確実な溶接が可能である。また、当接部６３０と連結部２１０との境界にレーザを照射する場合であっても、当接部６３０と連結部２１０との間は大きな段差ではないので、容易で確実な溶接が可能である。   Further, as shown in FIG. 6, each contact portion 630 is welded with two portions P <b> 30 corresponding to the edge 631. Thereby, at least two different sides of the first fixing member 600 are welded to the connecting portion 210. In the case of laser welding, the laser is irradiated in the direction indicated by the arrow Y4 in FIG. At this time, since the laser can be applied to the flat contact portion 630 as a whole, easy and reliable welding is possible. Further, even when laser is applied to the boundary between the contact portion 630 and the connecting portion 210, since there is no large step between the contact portion 630 and the connecting portion 210, easy and reliable welding is possible. is there.

以上のとおり、レーザ溶接をカバー部６１０及び当接部６３０のそれぞれの平坦部に照射することができる。一方、第一固定部材６００を用いずに第一突出部３３０の湾曲部等に直接レーザ溶接を照射した場合、照射される部分が不安定であり、溶接強度が不安定となる。本実施形態では、レーザが平坦もしくは段差の小さい部分に照射されるため、安定した溶接が可能となり、十分な溶接強度を得ることができる。その結果、振動や衝撃による導電部材３００の回転や変形を確実に抑制することができ、その回転や変形による緩みに起因する導電不良（電気抵抗の増大）を防ぐことができる。   As described above, laser welding can be applied to the flat portions of the cover portion 610 and the contact portion 630. On the other hand, when laser welding is directly applied to the curved portion or the like of the first protrusion 330 without using the first fixing member 600, the irradiated portion is unstable, and the welding strength becomes unstable. In the present embodiment, since the laser is irradiated on a flat or small step portion, stable welding is possible, and sufficient welding strength can be obtained. As a result, the rotation and deformation of the conductive member 300 due to vibration and impact can be reliably suppressed, and poor conduction (increase in electric resistance) due to looseness due to the rotation and deformation can be prevented.

連結部２１０と導電部材３００とを直接溶接する場合は、導電部材３００の形状（例えば、かしめにより形成された第一突出部３３０の湾曲形状）の影響で、不安定な溶接になるおそれがある。しかしながら、本実施の形態のように、第一固定部材６００に対して連結部２１０と導電部材３００とが溶接されるのであれば、第一固定部材６００を溶接し易い形状にすることができる。溶接しやすい形状には、例えば、上述したように第一固定部材６００の平坦な部分（カバー部６１０、当接部６３０）が該当する。第一固定部材６００によって溶接を容易に行うことができれば、安定した溶接が可能となる。溶接の安定化によって第一固定部材６００に対して連結部２１０と導電部材３００とを確実に接合することができ、導電部材３００の緩みもより抑制することができる。これは第二固定部材８００においても同様である。   When the connecting portion 210 and the conductive member 300 are directly welded, unstable welding may occur due to the influence of the shape of the conductive member 300 (for example, the curved shape of the first protrusion 330 formed by caulking). . However, if the connecting portion 210 and the conductive member 300 are welded to the first fixing member 600 as in the present embodiment, the first fixing member 600 can be shaped to be easily welded. For example, the flat portions (the cover portion 610 and the contact portion 630) of the first fixing member 600 correspond to the shape that is easy to weld. If welding can be easily performed by the first fixing member 600, stable welding is possible. By stabilizing the welding, the connecting portion 210 and the conductive member 300 can be reliably joined to the first fixing member 600, and loosening of the conductive member 300 can be further suppressed. The same applies to the second fixing member 800.

また、第一固定部材６００は、第一突出部３３０の高さに応じた２つ以上の折り曲げ部（壁部６２０、当接部６３０）を備えている。これにより、第一突出部３３０と第一固定部材６００との溶接及び連結部２１０と第一固定部材６００との溶接を容易に行うことができ、安定した溶接が可能となる。   The first fixing member 600 includes two or more bent portions (a wall portion 620 and a contact portion 630) according to the height of the first protruding portion 330. Thereby, welding with the 1st protrusion part 330 and the 1st fixing member 600 and welding with the connection part 210 and the 1st fixing member 600 can be performed easily, and stable welding is attained.

また、第一固定部材６００によって導電部材３００の第一突出部３３０が連結部２１０に固定されることになる。振動、衝撃が加わる場合、図５に示す矢印Ｙ１のような応力が導電部材３００の第一突出部３３０に作用することがある。本実施の形態では、第一固定部材６００が設けられているので、矢印Ｙ１方向の力が第一突出部３３０に作用したとしても、第一固定部材６００が第一突出部３３０の同方向への変形を規制する。これにより、第一突出部３３０の締結力が維持される。   Further, the first protrusion 330 of the conductive member 300 is fixed to the connecting portion 210 by the first fixing member 600. When vibration or impact is applied, stress as indicated by an arrow Y <b> 1 shown in FIG. 5 may act on the first protrusion 330 of the conductive member 300. In the present embodiment, since the first fixing member 600 is provided, even if a force in the direction of the arrow Y1 acts on the first protruding portion 330, the first fixing member 600 moves in the same direction of the first protruding portion 330. Regulate the deformation of Thereby, the fastening force of the 1st protrusion part 330 is maintained.

導電部材３００の端部がかしめられた構成では、連結部２１０又は正極集電体１２０と導電部材３００との間に緩みが生じた場合、再度、かしめ部を締結させて緩みを修正することはできない。しかしながら、本実施の形態においては、たとえ導電部材３００の端部がかしめられた構成であっても、第一固定部材６００によって導電部材３００と連結部２１０との間の緩みの発生を抑制することができる。よって、導電部材３００の端部がかしめられた電池にて長時間使用した場合でも緩みに起因した電気抵抗の増大を抑制することができる。つまり、導電部材３００がかしめられた構成において、第一固定部材６００を用いることによる効果は大きい。   In the configuration in which the end portion of the conductive member 300 is caulked, when loosening occurs between the connecting portion 210 or the positive electrode current collector 120 and the conductive member 300, it is possible to correct the loosening by fastening the caulking portion again. Can not. However, in this embodiment, even if the end portion of the conductive member 300 is caulked, the first fixing member 600 suppresses the occurrence of looseness between the conductive member 300 and the connecting portion 210. Can do. Therefore, even when the battery with the end portion of the conductive member 300 is used for a long time, an increase in electrical resistance due to loosening can be suppressed. That is, the effect obtained by using the first fixing member 600 in the configuration in which the conductive member 300 is caulked is great.

また、第一固定部材６００が金属製であるので、正極端子２００の連結部２１０と、導電部材３００との導電性を高めることができる。同様に、第二固定部材８００が金属製であるので、正極集電体１２０の端子側配置部１２１と、導電部材３００との導電性を高めることができる。また、第一固定部材６００及び第二固定部材８００が金属製であるので、溶接による固定が可能である。   Moreover, since the 1st fixing member 600 is metal, the electroconductivity with the connection part 210 of the positive electrode terminal 200 and the electrically-conductive member 300 can be improved. Similarly, since the 2nd fixing member 800 is metal, the electroconductivity with the terminal side arrangement | positioning part 121 of the positive electrode collector 120 and the electrically-conductive member 300 can be improved. Further, since the first fixing member 600 and the second fixing member 800 are made of metal, they can be fixed by welding.

また、第一固定部材６００または第二固定部材８００の厚みは、０．３ｍｍ以上１．５ｍｍ以下が好ましい。０．３ｍｍより薄いと第一固定部材６００又は第二固定部材８００自体が変形しやすくなり、導電部材３００の回転や変形を効率良く抑制する効果が小さくなる。１．５ｍｍより厚くなるとレーザ溶接が導電部材３００に届きにくく、接合力が弱くなる可能性がある。   Further, the thickness of the first fixing member 600 or the second fixing member 800 is preferably 0.3 mm or more and 1.5 mm or less. When it is thinner than 0.3 mm, the first fixing member 600 or the second fixing member 800 itself is easily deformed, and the effect of efficiently suppressing the rotation and deformation of the conductive member 300 is reduced. If the thickness is greater than 1.5 mm, laser welding is difficult to reach the conductive member 300 and the bonding force may be weakened.

（変形例１）
次に、上記実施の形態の変形例１について、説明する。本変形例では、第一固定部材及び第二固定部材に貫通孔が形成されている。なお、以下の説明において、上記実施の形態と同一の部分については同一の符号を付し、その説明を省略する場合がある。 (Modification 1)
Next, Modification 1 of the above embodiment will be described. In this modification, through holes are formed in the first fixing member and the second fixing member. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

図８は、本実施の形態の変形例１に係る導電部材３００、第一固定部材６００Ａ及び第二固定部材８００Ａの概略構成を示す断面図である。具体的には、図８は、図５に対応する図である。   FIG. 8 is a cross-sectional view illustrating a schematic configuration of the conductive member 300, the first fixing member 600A, and the second fixing member 800A according to the first modification of the present embodiment. Specifically, FIG. 8 corresponds to FIG.

図８に示すように、第一固定部材６００Ａのカバー部６１０ａには、貫通孔６６０が形成されている。貫通孔６６０は、上面視円形状の開口である。具体的には、貫通孔６６０は、第一突出部３３０の稜線３００Ｌがなす円とほぼ同軸の円形であり、稜線３００Ｌがなす円とほぼ同じ大きさに形成されている。貫通孔６６０が形成されているとレーザの照射箇所を明確に把握することできる。また、その貫通孔６６０の周縁の一部と導電部材３００の第一突出部３３０との境界部を溶接することができるので、導電部材３００と第一固定部材６００Ａとをより強固に溶接することができる。   As shown in FIG. 8, a through hole 660 is formed in the cover portion 610a of the first fixing member 600A. The through hole 660 is an opening having a circular shape when viewed from above. Specifically, the through-hole 660 is a circle that is substantially coaxial with the circle formed by the ridge line 300L of the first protrusion 330, and is formed to have approximately the same size as the circle formed by the ridge line 300L. When the through-hole 660 is formed, it is possible to clearly grasp the laser irradiation position. Moreover, since the boundary part of the peripheral part of the through-hole 660 and the 1st protrusion part 330 of the electrically-conductive member 300 can be welded, the electrically-conductive member 300 and 600 A of 1st fixing members are welded more firmly. Can do.

（変形例２）
次に、上記実施の形態の変形例２について説明する。本変形例では、一つの導電部材に対して一つの固定部材が設けられている。なお、以下の説明において、上記実施の形態及び変形例と同一の部分については同一の符号を付し、その説明を省略する場合がある。 (Modification 2)
Next, a second modification of the above embodiment will be described. In this modification, one fixing member is provided for one conductive member. In the following description, the same reference numerals are given to the same portions as those in the above-described embodiments and modifications, and the description thereof may be omitted.

図９は、本実施の形態の変形例２に係る導電部材３００、第一固定部材６００の概略構成を示す断面図である。図９に示す導電部材３００には、第一固定部材６００が取り付けられているものの、第二固定部材８００が設けられていない。図１０は、本実施の形態の変形例２に係る導電部材３００、第二固定部材８００の概略構成を示す断面図である。図１０に示す導電部材３００には、第二固定部材８００が取り付けられているものの、第一固定部材６００が設けられていない。蓄電素子１０の使用環境や、設計条件、仕様などを考慮して、第一固定部材６００と第二固定部材８００とを設けるか否かを判断すればよい。   FIG. 9 is a cross-sectional view illustrating a schematic configuration of the conductive member 300 and the first fixing member 600 according to Modification 2 of the present embodiment. Although the first fixing member 600 is attached to the conductive member 300 shown in FIG. 9, the second fixing member 800 is not provided. FIG. 10 is a cross-sectional view showing a schematic configuration of the conductive member 300 and the second fixing member 800 according to the second modification of the present embodiment. Although the second fixing member 800 is attached to the conductive member 300 shown in FIG. 10, the first fixing member 600 is not provided. Whether or not to provide the first fixing member 600 and the second fixing member 800 may be determined in consideration of the usage environment, design conditions, specifications, and the like of the power storage element 10.

ただし、上記実施の形態のとおり、第一固定部材６００及び第二固定部材８００を用いて、蓄電素子１０の内方と外方の両方で導電部材３００を固定することにより、導電部材３００の緩みや、その緩みに起因する気密漏れを防ぐことができる。   However, as in the above-described embodiment, the conductive member 300 is loosened by fixing the conductive member 300 both inside and outside the power storage element 10 using the first fixing member 600 and the second fixing member 800. In addition, it is possible to prevent airtight leakage due to the looseness.

（変形例３）
次に、上記実施の形態の変形例３について説明する。本変形例では、第一固定部材の一辺のみが連結部２１０に溶接されている。なお、以下の説明において、上記実施の形態と同一の部分については同一の符号を付し、その説明を省略する場合がある。 (Modification 3)
Next, Modification 3 of the above embodiment will be described. In this modification, only one side of the first fixing member is welded to the connecting portion 210. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

図１１は、本実施の形態の変形例３に係る第一固定部材６００Ｂの概略構成を示す斜視図である。図１１に示すように、第一固定部材６００Ｂの壁部６２０ｂは、カバー部６１０の一辺から連結部２１０に向けて折り曲げ形成されている。そして、壁部６２０ｂの先端部には、連結部２１０に面接触する当接部６３０ｂが設けられている。当接部６３０ｂは、縁辺６３１に対応する部分Ｐ３０が２箇所、溶接されている。このように、第一固定部材６００Ｂの少なくとも１つの辺が連結部２１０に溶接されていれば、第一固定部材６００Ｂを介して導電部材３００と、正極端子２００とを固定することが可能である。   FIG. 11 is a perspective view showing a schematic configuration of a first fixing member 600B according to Modification 3 of the present embodiment. As shown in FIG. 11, the wall portion 620 b of the first fixing member 600 </ b> B is formed to be bent from one side of the cover portion 610 toward the connecting portion 210. A contact portion 630b that comes into surface contact with the connecting portion 210 is provided at the tip of the wall portion 620b. The contact portion 630b is welded with two portions P30 corresponding to the edge 631. As described above, if at least one side of the first fixing member 600B is welded to the connecting portion 210, the conductive member 300 and the positive electrode terminal 200 can be fixed via the first fixing member 600B. .

（変形例４）
次に、上記実施の形態の変形例４について説明する。本変形例では、第一固定部材の周縁の一部が導電部材に接合されている。なお、以下の説明において、上記実施の形態と同一の部分については同一の符号を付し、その説明を省略する場合がある。 (Modification 4)
Next, Modification 4 of the above embodiment will be described. In this modification, a part of the periphery of the first fixing member is joined to the conductive member. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

図１２は、本実施の形態の変形例４に係る第一固定部材６００Ｃの概略構成を示す斜視図である。図１３は、本実施の形態の変形例４に係る導電部材３００、第一固定部材６００Ｃ及び第二固定部材８００Ｃの概略構成を示す断面図である。具体的には、図１３は、図１２に示されたＸＩＩＩ−ＸＩＩＩ線を含むＸＺ平面に平行な面で切断した場合の断面図である。なお、第二固定部材８００Ｃにおいては、第一固定部材６００Ｃと同構成であるので、ここでは説明を省略する。   FIG. 12 is a perspective view showing a schematic configuration of a first fixing member 600C according to Modification 4 of the present embodiment. FIG. 13 is a cross-sectional view showing a schematic configuration of the conductive member 300, the first fixing member 600C, and the second fixing member 800C according to Modification 4 of the present embodiment. Specifically, FIG. 13 is a cross-sectional view taken along a plane parallel to the XZ plane including the XIII-XIII line shown in FIG. Note that the second fixing member 800C has the same configuration as the first fixing member 600C, and thus the description thereof is omitted here.

図１２及び図１３に示すように、第一固定部材６００Ｃは、板体である板金により平面視略矩形状に形成されており、カバー部６１０ｃと、壁部６２０ｃと、当接部６３０ｃとを備える。   As shown in FIGS. 12 and 13, the first fixing member 600 </ b> C is formed in a substantially rectangular shape in plan view by a sheet metal that is a plate body, and includes a cover portion 610 c, a wall portion 620 c, and a contact portion 630 c. Prepare.

カバー部６１０ｃは、導電部材３００の第一突出部３３０を蓋体１１０の外方から覆う部位である。カバー部６１０は、平面視で略矩形状に形成されて、第一突出部３３０の稜線３３０Ｌに当接している。   The cover part 610 c is a part that covers the first protrusion 330 of the conductive member 300 from the outside of the lid 110. The cover part 610 is formed in a substantially rectangular shape in plan view, and is in contact with the ridgeline 330L of the first protrusion 330.

第一固定部材６００Ｃは、カバー部６１０ｃ及び当接部６３０ｃが溶接されることにより、第一突出部３３０及び連結部２１０に固定されている。ここで、カバー部６１０ｃと第一突出部３３０との溶接においては、カバー部６１０ｃの周縁と第一突出部３３０の稜線３３０Ｌとが溶接されている。この構成では、稜線３３０Ｌを把握することができるので、レーザを誤りなく照射することができる。また、また、そのカバー部６１０ｃの周縁の一部と導電部材３００の第一突出部３３０との境界部を溶接することができるので、導電部材３００と第一固定部材６００Ａとをより強固に溶接することができる。   The first fixing member 600C is fixed to the first projecting portion 330 and the connecting portion 210 by welding the cover portion 610c and the contact portion 630c. Here, in welding of the cover part 610c and the 1st protrusion part 330, the periphery of the cover part 610c and the ridgeline 330L of the 1st protrusion part 330 are welded. In this configuration, since the ridgeline 330L can be grasped, the laser can be irradiated without error. Moreover, since the boundary part of the peripheral part of the cover part 610c and the 1st protrusion part 330 of the electrically-conductive member 300 can be welded, the electrically-conductive member 300 and the 1st fixing member 600A are welded more firmly. can do.

（変形例５）
次に、上記実施の形態の変形例５について説明する。本変形例では、平板状の第一固定部材が導電部材に接合されている。なお、以下の説明において、上記実施の形態と同一の部分については同一の符号を付し、その説明を省略する場合がある。 (Modification 5)
Next, Modification 5 of the above embodiment will be described. In this modification, the flat plate-shaped first fixing member is joined to the conductive member. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

図１４は、本実施の形態の変形例５に係る導電部材３００Ｄ、第一固定部材６００Ｄ及び第二固定部材８００Ｄの概略構成を示す断面図である。なお、第二固定部材８００Ｄにおいては、第一固定部材６００Ｄと同構成であるので、ここでは説明を省略する。また、変形例５においては、導電部材３００Ｄの第一突出部３３０ｄの高さが、実施の形態に係る導電部材３００の第一突出部３３０よりも低く形成されている。同様に、導電部材３００Ｄの第二突出部３４０ｄの高さが、実施の形態に係る導電部材３００の第二突出部３４０よりも低く形成されている。   FIG. 14 is a cross-sectional view showing a schematic configuration of a conductive member 300D, a first fixing member 600D, and a second fixing member 800D according to Modification 5 of the present embodiment. Note that the second fixing member 800D has the same configuration as the first fixing member 600D, and thus the description thereof is omitted here. Moreover, in the modification 5, the height of the 1st protrusion part 330d of electrically conductive member 300D is formed lower than the 1st protrusion part 330 of the electrically conductive member 300 which concerns on embodiment. Similarly, the height of the second protrusion 340d of the conductive member 300D is lower than the second protrusion 340 of the conductive member 300 according to the embodiment.

第一固定部材６００Ｄは、弾性を有する平面視略矩形状の板体であり、図１４に示すように、導電部材３００Ｄの第一突出部３３０ｄを蓋体１１０の外方から覆っている。この際、第一固定部材６００Ｄは全体として曲げられており、その両端部が連結部２１０に接触するとともに、両端部よりも内側部分が第一突出部３３０ｄに接触している。そして、第一固定部材６００Ｄは、第一突出部３３０ｄ及び連結部２１０に溶接されることで、固定されている。このように、第一突出部３３０ｄの高さが低い場合、第一固定部材６００Ｄを折り曲げ加工しなくても、弾性のある板体を用いることで、第一突出部３３０ｄと第一固定部材６００Ｄとの溶接及び連結部２１０と第一固定部材６００Ｄとの溶接を容易に行うことができる。   The first fixing member 600D is a substantially rectangular plate body having elasticity in plan view, and covers the first protrusion 330d of the conductive member 300D from the outside of the lid 110 as shown in FIG. At this time, the first fixing member 600D is bent as a whole, and both end portions thereof are in contact with the connecting portion 210, and inner portions thereof are in contact with the first protruding portion 330d. The first fixing member 600D is fixed by being welded to the first projecting portion 330d and the connecting portion 210. As described above, when the height of the first protrusion 330d is low, the first protrusion 330d and the first fixing member 600D can be obtained by using an elastic plate without bending the first fixing member 600D. And welding of the connecting portion 210 and the first fixing member 600D can be easily performed.

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

例えば、上記実施の形態及びその変形例では、導電部材３００は、中空リベットであることとしたが、中実リベットであってもよい。   For example, in the above embodiment and its modifications, the conductive member 300 is a hollow rivet, but may be a solid rivet.

上記実施の形態及びその変形例では、正極端子２００は、接続ボルト２２０を有しているが、接続ボルトが設けられていなくてもよい。例えば、連結部２１０にバスバーを直接、溶接するような形態であってもよい。なお、負極端子２０１側についても同様である。   In the embodiment and the modification thereof, the positive terminal 200 has the connection bolt 220, but the connection bolt may not be provided. For example, the bus bar may be directly welded to the connecting portion 210. The same applies to the negative electrode terminal 201 side.

上記実施の形態及びその変形例では、正極端子２００の連結部２１０と導電部材３００との溶接及び正極集電体１２０と導電部材３００との溶接において、溶接の箇所及び溶接個所の数を示したが、これらに限定されるものではない。溶接の箇所や溶接個所の数は適宜設定すればよい。   In the said embodiment and its modification, in the welding with the connection part 210 and the electrically-conductive member 300 of the positive electrode terminal 200, and the welding with the positive electrode collector 120 and the electrically-conductive member 300, the number of the welding locations and the number of welding locations were shown. However, it is not limited to these. What is necessary is just to set suitably the location of welding and the number of welding locations.

また、上記実施の形態及び変形例では、平面視略矩形状の第一固定部材６００及び第二固定部材８００を例示して説明したが、第一固定部材及び第二固定部材の形状は如何様であってもよい。固定対象を安定して固定する観点からすると、第一固定部材及び第二固定部材の形状は略多角形状であることが望ましい。ここで第一固定部材及び第二固定部材は、正確な多角形状でなくとも、平面視したときの外形が概ね多角形状となる形状であればよい。すなわち、多角形をなす各辺が平面視で直線状でなくともよく、曲線状であってもよい。また、上述した第一固定部材６００のように、平面視で概ね多角形状に見えるのであれば、角部が湾曲していても、外周に段差が設けられていてもよい。   In the embodiment and the modification, the first fixing member 600 and the second fixing member 800 having a substantially rectangular shape in plan view are described as examples. However, the shapes of the first fixing member and the second fixing member are not limited. It may be. From the viewpoint of stably fixing the object to be fixed, it is desirable that the first fixing member and the second fixing member have substantially polygonal shapes. Here, the first fixing member and the second fixing member do not have to be an accurate polygonal shape, but may be any shape as long as the outer shape when viewed in plan is substantially a polygonal shape. That is, each side forming the polygon may not be linear in a plan view, but may be curved. In addition, as in the first fixing member 600 described above, as long as it looks substantially polygonal in plan view, the corners may be curved or a step may be provided on the outer periphery.

また、上記実施の形態及び変形例では、第一固定部材６００及び第二固定部材８００が板金により形成されている場合を例示して説明したが、第一固定部材６００及び第二固定部材８００は板金でなくともよい。例えば、少なくとも一つのワイヤ状の部材からなる第一固定部材及び第二固定部材を用いて、第一突出部３３０及び第二突出部３４０を固定してもよい。   Moreover, in the said embodiment and modification, although the case where the 1st fixing member 600 and the 2nd fixing member 800 were formed with the sheet metal was illustrated and demonstrated, the 1st fixing member 600 and the 2nd fixing member 800 are described. It does not have to be sheet metal. For example, you may fix the 1st protrusion part 330 and the 2nd protrusion part 340 using the 1st fixing member and 2nd fixing member which consist of at least 1 wire-shaped member.

また、上記実施の形態及びその変形例では、固定部材（第一固定部材６００及び第二固定部材８００）が金属製である場合を例示して説明したが、固定部材は例えばポリフェニレンサルファイド（ＰＰＳ）等の樹脂製であってもよい。樹脂製である場合には、固定部材を溶接ではなく接着剤により固定対象に接着させればよい。なお、容器１００の内方に配置される固定部材に対しては、電解液の影響を受けない接着剤を用いることがよい。   Moreover, in the said embodiment and its modification example, although the fixing member (the 1st fixing member 600 and the 2nd fixing member 800) illustrated and demonstrated the case where it was metal, a fixing member is polyphenylene sulfide (PPS), for example. It may be made of resin. If it is made of resin, the fixing member may be bonded to the object to be fixed by an adhesive instead of welding. In addition, it is good to use the adhesive agent which does not receive to the influence of electrolyte solution with respect to the fixing member arrange | positioned inside the container 100. FIG.

また、上記実施の形態及び上記変形例を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。   Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention.

本発明は、蓄電性能を長期的に維持することのできる蓄電素子を提供することができる。   The present invention can provide a power storage element capable of maintaining power storage performance for a long period of time.

１０ 蓄電素子
１００ 容器
１１０ 蓋体
１１１ 容器本体
１１２ 蓋体開口部
１２０ 正極集電体（集電体）
１２１ 端子側配置部
１２２ 電極体接続部
１２３ 集電体開口部
１３０ 負極集電体（集電体）
１４０ 電極体
２００ 正極端子（端子）
２０１ 負極端子（端子）
２０２，２１０ 連結部
２０３，２２０ 接続ボルト
２１１ 第二開口部
２１２ 第一開口部
３００，３０１，３００Ｄ 導電部材
３１０ 柱部
３１１ 空間
３１２ 空間
３２０ フランジ部
３３０，３３０ｄ 第一突出部
３３０Ｌ 稜線
３４０，３４０ｄ 第二突出部
４００ 第一封止部材
４１０ 板状部
４２０ 筒状部
４２１ 筒状部開口部
５００ 第二封止部材
５１０ 第二封止部材開口部
５２０ 第二封止部材凹部
６００，６００Ａ，６００Ｂ，６００Ｃ，６００Ｄ，６０１ 第一固定部材
６１０，６１０ａ カバー部
６１１ 角部
６２０，６２０ｂ，６２０ｃ 壁部
６３０，６３０ｂ，６３０ｃ 当接部
６３１ 縁辺
６６０ 貫通孔
８００，８００Ａ，８００Ｃ，８００Ｄ，８０１ 第二固定部材
８１０ａ カバー部 DESCRIPTION OF SYMBOLS 10 Power storage element 100 Container 110 Cover body 111 Container body 112 Cover body opening 120 Positive electrode current collector (current collector)
121 Terminal side arrangement part 122 Electrode body connection part 123 Current collector opening part 130 Negative electrode current collector (current collector)
140 Electrode body 200 Positive electrode terminal (terminal)
201 Negative terminal (terminal)
202, 210 connecting portion 203, 220 connecting bolt 211 second opening portion 212 first opening portion 300, 301, 300D conductive member 310 column portion 311 space 312 space 320 flange portion 330, 330d first projecting portion 330L ridge line 340, 340d first Two projecting portions 400 First sealing member 410 Plate-shaped portion 420 Tube-shaped portion 421 Tube-shaped portion opening 500 Second sealing member 510 Second sealing member opening 520 Second sealing member recess 600, 600A, 600B, 600C, 600D, 601 First fixing member 610, 610a Cover portion 611 Corner portion 620, 620b, 620c Wall portion 630, 630b, 630c Abutting portion 631 Edge 660 Through hole 800, 800A, 800C, 800D, 801 Second fixing member 810a cover part

Claims (7)

容器と、
前記容器の外方に配置された端子、又は、前記容器の内方に配置された集電体と、
前記容器を貫通し、かつ、前記集電体又は前記端子と接続される導電部材と、
前記集電体又は前記端子と前記導電部材とを接合する固定部材と、を備える、
蓄電素子。 A container,
A terminal disposed outside the container, or a current collector disposed inside the container;
A conductive member that penetrates the container and is connected to the current collector or the terminal;
A fixing member that joins the current collector or the terminal and the conductive member;
Power storage element. 前記導電部材の端部がかしめられており、
前記導電部材の端部と前記容器との間に前記端子又は前記集電体が固定されている、
請求項１に記載の蓄電素子。 The end of the conductive member is caulked,
The terminal or the current collector is fixed between the end of the conductive member and the container,
The electricity storage device according to claim 1. 前記固定部材は、板体であり、前記板体の少なくとも異なる二辺が、前記集電体又は前記端子に接合されている、
請求項１又は２に記載の蓄電素子。 The fixing member is a plate, and at least two different sides of the plate are joined to the current collector or the terminal.
The electrical storage element of Claim 1 or 2. 前記端子と、前記集電体とを備え、
前記端子と前記集電体とは前記導電部材で接続され、
前記端子と前記集電体とはそれぞれ前記導電部材と前記固定部材で接合されている、
請求項１〜３のいずれか一項に記載の蓄電素子。 Comprising the terminal and the current collector;
The terminal and the current collector are connected by the conductive member,
The terminal and the current collector are joined by the conductive member and the fixing member, respectively.
The electrical storage element as described in any one of Claims 1-3. 前記固定部材に貫通孔が形成されており、前記貫通孔の周縁の一部と前記導電部材とが接合されている、
請求項１〜４のいずれか一項に記載の蓄電素子。 A through hole is formed in the fixing member, and a part of the periphery of the through hole is joined to the conductive member.
The electrical storage element as described in any one of Claims 1-4. 前記固定部材が板体であり、前記板体の周縁の一部と前記導電部材とが接合されている、
請求項１〜４のいずれか一項に記載の蓄電素子。 The fixing member is a plate, and a part of the periphery of the plate is joined to the conductive member.
The electrical storage element as described in any one of Claims 1-4. 前記固定部材は板体であり、２つ以上の折り曲げ部を有する、
請求項１〜６のいずれか一項に記載の蓄電素子。 The fixing member is a plate body and has two or more bent portions.
The electrical storage element as described in any one of Claims 1-6.
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Citations (2)

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JP2013239432A (en) * 2012-04-17 2013-11-28 Gs Yuasa Corp Power storage element
JP2014116139A (en) * 2012-12-07 2014-06-26 Toyota Motor Corp Sealed battery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013239432A (en) * 2012-04-17 2013-11-28 Gs Yuasa Corp Power storage element
JP2014116139A (en) * 2012-12-07 2014-06-26 Toyota Motor Corp Sealed battery

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