JP6740739B2 - Storage element - Google Patents

Storage element Download PDF

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JP6740739B2
JP6740739B2 JP2016121233A JP2016121233A JP6740739B2 JP 6740739 B2 JP6740739 B2 JP 6740739B2 JP 2016121233 A JP2016121233 A JP 2016121233A JP 2016121233 A JP2016121233 A JP 2016121233A JP 6740739 B2 JP6740739 B2 JP 6740739B2
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fixing member
current collector
conductive member
terminal
positive electrode
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JP2017045717A (en
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良太 道畑
良太 道畑
隆弘 志築
隆弘 志築
直樹 太田
直樹 太田
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GS Yuasa International Ltd
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GS Yuasa International Ltd
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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
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/543Terminals
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

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 arranged inside the container are connected by a conductive member. Then, the connection strength between the terminal or the current collector and the conductive member is secured by welding the terminal or the current collector and the conductive member (for example, refer to 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 the current collector and the conductive member are directly welded, the crimped 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 done reliably. If the welding is unstable, vibration or shock may cause loosening between the terminal or the current collector and the conductive member. This slack induces an increase in electric resistance, and the storage performance of the storage element cannot be sufficiently 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 to solve the above problems, and suppresses looseness between a terminal or a current collector and a conductive member, thereby providing a power storage device capable of maintaining power storage performance for a long period of time. 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 device according to one embodiment of the present invention includes a container, a terminal arranged outside the container, or a current collector arranged inside the container, and a penetrating container. And a conductive member that is connected to the current collector or the terminal, and a fixing member that joins the current collector or the terminal to 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, it is possible to suppress looseness between the current collector or the terminal and the conductive member, and it is possible to maintain the power storage performance for a long period of 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。FIG. 3 is a perspective view showing each constituent element included in the power storage element by separating the container body of the container of the power storage element according to the embodiment of the present invention. 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 which the positive electrode terminal and negative electrode terminal which concern on embodiment of this invention are fixed to a cover with a positive electrode electrical power collector and a negative electrode electrical power 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。FIG. 3 is an exploded view showing each component when the configuration around the positive electrode terminal of the electricity storage device according to the embodiment of the present invention is disassembled. 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 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 the 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 first fixing member according to the present 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, the 1st fixing member, and the 2nd fixing member which concern on the modification 1 of this Embodiment. 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 and the 1st fixing member which concern on the modification 2 of this Embodiment. 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 and the 2nd fixing member which concern on the modification 2 of this Embodiment. 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 the 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 the 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, the 1st fixing member, and the 2nd fixing member which concern on the modification 4 of this Embodiment. 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, the 1st fixing member, and the 2nd fixing member which concern on the modified example 5 of this Embodiment.

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, an electric storage device according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, manufacturing steps, order of manufacturing steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the constituent elements in the following embodiments, the constituent elements that are not described in the independent claims showing the highest concept are described as arbitrary 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 storage element 10 will be described. FIG. 1 is a perspective view schematically showing an external appearance of a power storage element 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing each component provided in the storage element 10 by separating the container body 111 of the container 100 of the storage element 10 according to the embodiment of the present invention. In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction may be described below as the vertical direction. However, the Z-axis direction may not be the vertical direction depending on the usage. Therefore, the Z-axis direction is not limited to the vertical direction. The same applies to subsequent figures.

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。 Power storage element 10 is a secondary battery capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The storage element 10 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery or a capacitor.

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 electricity storage device 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, and a first electrode. 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。 Further, a liquid such as an electrolytic solution (non-aqueous electrolyte) is sealed inside the container 100 of the electricity storage device 10, but the liquid is not shown. Note that the electrolytic solution sealed in the container 100 is not particularly limited in its type as long as it does not impair the performance of the electricity storage device 10, and various electrolytic solutions 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 main body 111 having a rectangular tubular shape and a bottom, and a lid 110 that is a plate-like member that closes the opening of the container main body 111. In addition, the container 100 can seal the inside by housing the positive electrode current collector 120, the negative electrode current collector 130, the electrode body 140, etc., and then welding the lid 110 and the container body 111. It can be done. 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, 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. The positive electrode is one in which a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip metal foil made of aluminum, an aluminum alloy or the like. Further, the negative electrode is one in which a negative electrode active material layer is formed on a negative electrode base material foil which is a long strip-shaped metal foil made of copper or a copper alloy. The separator is a microporous sheet made of resin. Here, as 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, any known material can be used as long as it is a positive electrode active material or a negative electrode active material capable of inserting and extracting 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 structure in which a separator is sandwiched between a negative electrode and a positive electrode, and is electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130. Has been done. Although the electrode body 140 has an elliptical cross section in FIG. 2, it may be circular or elliptical. Further, the shape of the electrode body 140 is not limited to the winding type, and may be a laminated type in which flat electrode 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 arranged 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 arranged outside the container 100 and is electrically connected to the negative electrode of the electrode body 140. That is, 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 electricity storage device 10, and generate electricity in the inner space of the electricity storage device 10 to store the electricity in the electrode body 140. 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 110 arranged 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. The detailed structure 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 arranged inside the container 100, that is, on the inner surface of the lid 110 (the surface on the negative side in the Z-axis direction). 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 having 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 that are 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 made of aluminum, an aluminum alloy, or the like, like the positive electrode base material foil of the electrode body 140. Further, the negative electrode current collector 130 is formed of copper, a copper alloy, or the like, like the negative electrode base material 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 110, and the conductive member 301 connects the negative electrode terminal 201 and the negative electrode current collector 130 to the lid 110. Fix and connect to. The conductive members 300 and 301 are formed of a conductive member such as metal. The conductive member 300 is preferably made of aluminum, an aluminum alloy, or the like, like the positive electrode base material foil of the positive electrode current collector 120 and the electrode body 140. In addition, the conductive member 301 is preferably formed of copper, a copper alloy, or the like, like the negative electrode base material 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. The first fixing member 600 and the second fixing member 800 are preferably made of aluminum, an aluminum alloy, or the like, like the positive electrode base material foil of the positive electrode current collector 120 and the electrode body 140. Further, the first fixing member 601 and the second fixing member 801 are preferably formed of copper, a copper alloy, or the like, like the negative electrode base material foil of the negative electrode current collector 130 and the electrode body 140.

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 body 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, hereinafter, the configuration on the positive electrode terminal 200 side will be mainly described, and the configuration on the negative electrode terminal 201 side will be described. Is 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 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 the configuration around the positive electrode terminal 200 and the negative electrode terminal 201 when the electricity storage device 10 shown in FIG. 2 is cut along a plane parallel to the XZ plane including the III-III line. It is a figure.

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 electricity storage device 10 further includes a first sealing member 400 and a second sealing member 500 on the side of the positive electrode terminal 200 and the positive electrode current collector 120, and the positive electrode terminal 200 is It has a connecting portion 210 and a connecting bolt 220. Further, the positive electrode current collector 120 has a plate-shaped terminal side placement 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 arranged outside the container 100. That is, the connecting portion 210 is a main body portion of the positive electrode terminal 200, and is arranged above the lid 110 (on the plus side in the Z-axis direction). The connecting portion 210 is formed of a conductive member such as 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 part 210 is fixed to the lid 110 together with the terminal side placement part 121 of the positive electrode current collector 120 by the conductive member 300. The connection bolt 220 is a bolt-shaped member that is disposed so as to project to the outside of the container 100 from the first opening 212 (see FIG. 4) of the coupling portion 210, and is a bus bar that connects the electrode terminals of the storage element 10 (see FIG. Connected (not shown). The connection bolt 220 is formed of a conductive member such as metal (eg, 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, at least a part of which is arranged between the positive electrode terminal 200 and the lid 110. The first sealing member 400 is preferably made of an insulating material that has 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 a part thereof is arranged between the terminal side arrangement portion 121 of the positive electrode current collector 120 and the lid 110. The second sealing member 500 is preferably formed of an insulating member that has lower rigidity than the lid 110 and is formed of, for example, 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 the configuration in which the positive electrode terminal 200 is fixed to the lid body 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, hereinafter, the configuration on the positive electrode terminal 200 side will be mainly described, and the configuration on the negative electrode terminal 201 side will be described. Is 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 showing 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-shaped portion 410 is arranged between the connecting portion 210 of the positive electrode terminal 200, the flange portion 320 of the conductive member 300, and the lid 110. The plate-shaped portion 410 is arranged in contact with the lid 110. Note that the plate-shaped portion 410 may be arranged between at least one of the connecting portion 210 and the flange portion 320 and the lid 110.

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。 Further, the tubular portion 420 penetrates the lid 110 and the second sealing member 500 and is arranged around the conductive member 300. The second sealing member 500 is arranged 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 arranged 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 pillar portion 310 penetrates the connecting portion 210, the lid 110, the first sealing member 400, the second sealing member 500, and the terminal side arrangement portion 121 of the positive electrode current collector 120. Are arranged. Further, 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. By sandwiching the connecting portion 210 and the terminal side arrangement portion 121, the connecting portion 210 and the positive electrode current collector 120 are fixed to the lid 110.

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 the rivet as the conductive member 300 in a state where the first sealing member 400, the lid 110 and the second sealing member 500 are sandwiched, and the lid 110. It is fixed to. At this time, in the conductive member 300, by caulking the upper part and the lower part, the upper space 311 and the lower space 312 of the column part 310 are expanded outward, and the upper end part and the lower end part of the column part 310 are expanded. 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 protruding portion 330 and the second protruding portion 340 are caulked portions formed by caulking, and are arranged so as to protrude along the lid body 110 so as to sandwich the lid body 110. Specifically, the first projecting portion 330 is an end portion of the conductive member 300 on the positive electrode terminal 200 side (Z axis direction plus side), that is, outside the container 100 and above the connecting portion 210. It is the caulking part. The second protrusion 340 is arranged at the end of the conductive member 300 on the positive electrode current collector 120 side (negative side in the Z-axis direction), that is, inside the container 100 and below the terminal side arrangement portion 121. It is an annular crimping part.

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 arranged and fixed between the first protruding portion 330 and the lid 110. Similarly, the terminal side arrangement part 121 of the positive electrode current collector 120 and the second sealing member 500 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 in which 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 abuts the second projecting portion 340 so that the terminal side placement portion 121 of the positive electrode current collector 120 is flat. It is fixed to the section. As a result, 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. Note that the first fixing member 600 and the second fixing member 800 have different fixing targets, but have the same configuration. Therefore, the first fixing member 600 will be mainly described below, and the second fixing member 800 will be described. Will be 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 this embodiment. FIG. 7 is a plan view of the first fixing member 600 according to this embodiment. As shown in FIGS. 6 and 7, the first fixing member 600 is formed of a metal plate, which is a plate, in a substantially rectangular shape in a plan view, and includes a cover portion 610, a wall portion 620, and an abutting 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 portion 610 is a portion that covers the first protruding portion 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 a plan view. It should be noted that one corner portion 611 of the cover portion 610 is formed in an arc shape. The cover portion 610 is in contact with the ridgeline 330L of the first protruding portion 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 from each of two different sides of the cover portion 610 toward the connecting portion 210. Specifically, the wall portion 620 is provided on two sides of the cover portion 610. 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 provided. Through this gap, the contact state between the cover portion 610 and the first protruding portion 330 can be visually recognized, and the confirmation work 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. It suffices to have 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。 Then, the first fixing member 600 is fixed to the first projecting portion 330 and the connecting portion 210 by welding the cover portion 610 and the contact portion 630. Specifically, as shown in FIG. 6, in the cover portion 610, four portions P10 corresponding to the ridgeline 330L of the first protruding portion 330 are welded. Examples of welding include laser welding. In the case of laser welding, laser is emitted in the direction shown by arrow Y3 in FIG. At this time, since the laser can be applied to the flat part of the cover part 610, easy and reliable welding can be performed.

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 at two portions P30 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, laser is emitted in the direction shown by 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 can be performed. Further, even when the 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 can be performed. 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 the curved portion of the first protrusion 330 is directly irradiated with laser welding 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 applied to a flat portion or a portion having a small step, stable welding is possible and sufficient welding strength can be obtained. As a result, it is possible to reliably prevent the conductive member 300 from rotating or deforming due to vibration or impact, and to prevent conductive failure (increase in electrical resistance) due to loosening due to the rotating or deforming.

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 shape of the conductive member 300 (for example, the curved shape of the first protrusion 330 formed by caulking). .. However, as in the present embodiment, if the connecting portion 210 and the conductive member 300 are welded to the first fixing member 600, the first fixing member 600 can have a shape that facilitates welding. For example, the flat portion (cover portion 610, contact portion 630) of the first fixing member 600 corresponds to the shape that facilitates welding, as described above. If welding can be easily performed by the first fixing member 600, stable welding can be performed. By stabilizing the welding, the connecting portion 210 and the conductive member 300 can be reliably joined to the first fixing member 600, and the loosening of the conductive member 300 can be further suppressed. This also 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。 Further, the first fixing member 600 includes two or more bent portions (the wall portion 620 and the contact portion 630) according to the height of the first protruding portion 330. Thereby, the welding of the first protrusion 330 and the first fixing member 600 and the welding of the connecting portion 210 and the first fixing member 600 can be easily performed, and stable welding can be performed.

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。 In addition, 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 such as the arrow Y1 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 the force in the arrow Y1 direction acts on the first protrusion 330, the first fixing member 600 moves in the same direction as the first protrusion 330. Regulate the deformation of. Thereby, the fastening force of the first protrusion 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 crimped, if looseness occurs between the connecting portion 210 or the positive electrode current collector 120 and the conductive member 300, it is not possible to refasten the crimped portion to correct the looseness. Can not. However, in the present embodiment, even if the end portion of conductive member 300 is crimped, the first fixing member 600 suppresses the occurrence of looseness between conductive member 300 and connecting portion 210. You can Therefore, even when the battery is used for a long time in a battery in which the end of the conductive member 300 is crimped, it is possible to suppress an increase in electric resistance due to loosening. That is, in the configuration in which the conductive member 300 is crimped, the effect of using the first fixing member 600 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。 Further, since the first fixing member 600 is made of metal, the conductivity between the connecting portion 210 of the positive electrode terminal 200 and the conductive member 300 can be increased. Similarly, since the second fixing member 800 is made of metal, the conductivity between the terminal side placement portion 121 of the positive electrode current collector 120 and the conductive member 300 can be increased. Moreover, 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。 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. If the thickness is less 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 it is thicker than 1.5 mm, it is difficult for the laser welding to reach the conductive member 300, and the joining 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, a first modification 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 will be 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 showing 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 is a diagram corresponding 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 a circular opening in a top view. Specifically, the through hole 660 is a circle that is substantially coaxial with the circle formed by the ridgeline 300L of the first protrusion 330, and is formed to have substantially the same size as the circle formed by the ridgeline 300L. When the through hole 660 is formed, it is possible to clearly understand the laser irradiation position. In addition, since a part of the peripheral edge of the through hole 660 and the boundary portion of the first protrusion 330 of the conductive member 300 can be welded, the conductive member 300 and the first fixing member 600A can be welded more firmly. You can

(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 parts as those in the above-described embodiment and modification are denoted by the same reference numerals, 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 showing a schematic configuration of the conductive member 300 and the first fixing member 600 according to the second modification of the present embodiment. The first fixing member 600 is attached to the conductive member 300 shown in FIG. 9, but the second fixing member 800 is not provided. FIG. 10 is a 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. The second fixing member 800 is attached to the conductive member 300 shown in FIG. 10, but the first fixing member 600 is not provided. It may be determined whether or not the first fixing member 600 and the second fixing member 800 are provided in consideration of the use environment of the power storage element 10, the design conditions, the specifications, and the like.

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 first fixing member 600 and the second fixing member 800 are used to fix the conductive member 300 both inside and outside the power storage element 10, thereby loosening the conductive member 300. Also, it is possible to prevent airtight leak 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, a third modified example 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 will be 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 which shows schematic structure of the 1st fixing member 600B which concerns on the modification 3 of this Embodiment. As shown in FIG. 11, the wall portion 620b of the first fixing member 600B is formed by bending 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 at two portions P30 corresponding to the edge 631. Thus, 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, a modified example 4 of the above embodiment will be described. In this modification, a part of the peripheral edge of the first fixing member is joined to the conductive member. In the following description, the same parts as those in the above embodiment will be 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 the modified example 4 of the present embodiment. Specifically, FIG. 13 is a cross-sectional view taken along a plane parallel to the XZ plane including the line XIII-XIII shown in FIG. Since the second fixing member 800C has the same structure as the first fixing member 600C, 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 600C is formed of a metal plate, which is a plate, in a substantially rectangular shape in a plan view, and includes a cover portion 610c, a wall portion 620c, and an abutting portion 630c. 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 portion 610c is a portion that covers the first protruding portion 330 of the conductive member 300 from the outside of the lid 110. The cover portion 610 is formed in a substantially rectangular shape in a plan view and is in contact with the ridge line 330L of the first protruding portion 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 the cover portion 610c and the first protruding portion 330, the peripheral edge of the cover portion 610c and the ridge line 330L of the first protruding portion 330 are welded. With this configuration, since the ridge line 330L can be grasped, it is possible to irradiate the laser without error. Moreover, since a boundary portion between a part of the peripheral edge of the cover portion 610c and the first protruding portion 330 of the conductive member 300 can be welded, the conductive member 300 and the first 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, a modified example 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 will be 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 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. Since the second fixing member 800D has the same configuration as the first fixing member 600D, the description thereof will be omitted here. Further, in the modified example 5, the height of the first protruding portion 330d of the conductive member 300D is formed lower than that of the first protruding portion 330 of the conductive member 300 according to the embodiment. Similarly, the height of the second protrusion 340d of the conductive member 300D is formed lower than that of 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 plate body that is elastic and has a substantially rectangular shape in a plan view, and covers the first protruding portion 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 ends of the first fixing member 600D are in contact with the connecting part 210, and inner portions of the first fixing member 600D are in contact with the first protruding part 330d. Then, the first fixing member 600D is fixed by being welded to the first protruding 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 formed by using the elastic plate body without bending the first fixing member 600D. And the connecting portion 210 and the first fixing member 600D can be easily welded.

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 elements according to the embodiments and the modifications thereof of the present invention have been described above, the present invention is not limited to the above embodiments and the modifications thereof. That is, it should be considered that the embodiments and their modifications disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

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, although the conductive member 300 is a hollow rivet in the above-described embodiment and its modifications, it 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 above-described embodiment and its modification, the positive electrode 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 above-described embodiment and its modification, the welding location and the number of welding locations are shown in the welding between the connecting portion 210 of the positive electrode terminal 200 and the conductive member 300 and the welding between the positive electrode current collector 120 and the conductive member 300. However, it is not limited to these. The number of welding points and welding points may be set as appropriate.

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。 Further, in the above-described embodiment and modification, the first fixing member 600 and the second fixing member 800, which are substantially rectangular in plan view, are illustrated and described, but how the shapes of the first fixing member and the second fixing member are May be From the viewpoint of stably fixing the fixing target, it is desirable that the shapes of the first fixing member and the second fixing member are substantially polygonal. Here, the first fixing member and the second fixing member do not have to have an accurate polygonal shape, but may have any shape as long as the outer shape when viewed in plan is substantially polygonal. That is, each side of the polygon does not have to be linear in plan view, and may be curved. Further, as in the case of the first fixing member 600 described above, the corners may be curved or a step may be provided on the outer periphery as long as it looks like a polygon in a plan view.

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 of the sheet metal was illustrated and demonstrated, the 1st fixing member 600 and the 2nd fixing member 800 are It need not be sheet metal. For example, the first protrusion 330 and the second protrusion 340 may be fixed by using a first fixing member and a second fixing member that are at least one 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, although the case where the fixing member (the 1st fixing member 600 and the 2nd fixing member 800) was made of metal was illustrated and demonstrated, the fixing member is polyphenylene sulfide (PPS), for example. It may be made of a resin such as. In the case of resin, the fixing member may be adhered to the object to be fixed by an adhesive instead of welding. An adhesive that is not affected by the electrolytic solution may be used for the fixing member arranged inside the container 100.

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。 Further, a mode constructed by arbitrarily combining the above-mentioned embodiment and the above-mentioned modified examples is also included 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。 INDUSTRIAL APPLICABILITY The present invention can provide a power storage element that can maintain 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
10 Storage Element 100 Container 110 Lid 111 Container Main Body 112 Lid Opening 120 Positive Electrode Current Collector (Current Collector)
121 Terminal side arrangement part 122 Electrode body connection part 123 Current collector opening 130 Negative electrode current collector (current collector)
140 electrode body 200 positive electrode terminal (terminal)
201 Negative electrode terminal (terminal)
202,210 Connection part 203,220 Connection bolt 211 Second opening part 212 First opening part 300,301,300D Conductive member 310 Column part 311 Space 312 Space 320 Flange part 330,330d First protrusion part 330L Ridge line 340,340d No. Two protrusions 400 First sealing member 410 Plate portion 420 Cylindrical portion 421 Cylindrical 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 (8)

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、
前記導電部材の端部はかしめられており、
前記固定部材は、板体であって、前記集電体又は前記端子と前記導電部材の端部とに接合されている、
蓄電素子。
A container,
A terminal arranged on the outside of the container, or a current collector arranged on the inside of the container,
A conductive member penetrating the container, and connected to the current collector or the terminal,
E Bei and a fixing member for bonding the conductive member and the current collector or the terminal,
The end of the conductive member is crimped,
The fixing member is a plate, and is joined to the current collector or the terminal and the end of the conductive member,
Power storage element.
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 terminal or the current collector is secured between the end portion and the container before Kishirubeden member,
The electricity storage device according to claim 1.
前記固定部材は、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 has at least two different sides of the front Symbol plate body is bonded to the current collector or the terminal,
The electricity storage device according to claim 1.
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 respectively joined by the conductive member and the fixing member,
The electricity storage device according to claim 1.
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 peripheral edge of the through hole and the conductive member are joined.
The electricity storage device according to claim 1.
前記固定部材は、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 , a part of the peripheral edge of the plate body and the conductive member are joined,
The electricity storage device according to claim 1.
前記固定部材は、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 has two or more bent portions,
The electricity storage device according to claim 1.
容器と、 A container,
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、 A terminal arranged on the outside of the container, or a current collector arranged on the inside of the container,
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、 A conductive member penetrating the container, and connected to the current collector or the terminal,
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、 A fixing member that joins the current collector or the terminal and the conductive member,
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、 The fixing member is a plate, and at least two different sides of the plate are joined to the current collector or the terminal.
蓄電素子。 Power storage element.
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