JP2014035828A - Power storage device - Google Patents

Power storage device Download PDF

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JP2014035828A
JP2014035828A JP2012175163A JP2012175163A JP2014035828A JP 2014035828 A JP2014035828 A JP 2014035828A JP 2012175163 A JP2012175163 A JP 2012175163A JP 2012175163 A JP2012175163 A JP 2012175163A JP 2014035828 A JP2014035828 A JP 2014035828A
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conductive member
positive electrode
terminal
negative electrode
fastening
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JP6007659B2 (en
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Motoaki Okuda
元章 奥田
Atsushi Minamigata
厚志 南形
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Toyota Industries Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of reducing electrical resistance of a connection for electrically connecting an electrode terminal and a conductive member.SOLUTION: A positive electrode terminal 15 includes an outer terminal member 32 which protrudes to the outside of a case 11, and a metallic fastening member 33 which is arranged inside of the case 11 and electrically connected to the outer terminal member 32. A positive electrode conductive member 30 includes a metallic tip 30a electrically connected to the fastening member 33, and in the fastening member 33, a protrusion 36 is provided which protrudes toward the positive electrode conductive member 30 and comes into contact with the positive electrode conductive member 30.

Description

本発明は、蓄電装置に関する。   The present invention relates to a power storage device.

従来から、ＥＶ（Electric Vehicle）やＰＨＶ（Plug-in Hybrid Vehicle）などの車両に搭載される蓄電装置としては、リチウムイオン二次電池や、ニッケル水素二次電池などがよく知られている。例えば、リチウムイオン二次電池としては、シート状の電極を積層又は捲回して電極組立体を形成するとともに、電極における活物質の未塗工部を層状に重ね合わせて形成した未塗工部群と、ケースの外部に突設された電極端子とを導電部材により電気的に接続したものがある（例えば特許文献１）。   Conventionally, lithium ion secondary batteries, nickel-hydrogen secondary batteries, and the like are well known as power storage devices mounted on vehicles such as EVs (Electric Vehicles) and PHVs (Plug-in Hybrid Vehicles). For example, as a lithium ion secondary battery, an electrode assembly is formed by laminating or winding sheet-like electrodes, and an uncoated portion group formed by overlapping uncoated portions of active materials in electrodes in layers. And an electrode terminal protruding outside the case are electrically connected by a conductive member (for example, Patent Document 1).

特開２０１１−２１０７１７号公報JP 2011-210717A

ところで、電極端子や導電部材は、一般に金属製であることから、その表面には、酸化被膜（不動態被膜）が形成されてしまう。このため、電極端子と導電部材とが酸化被膜を介して接触し、電気的に接続されている場合には、電極端子と導電部材との接触部における電気抵抗が大きくなるという問題がある。   By the way, since an electrode terminal and an electrically-conductive member are generally metal, an oxide film (passive film) will be formed in the surface. For this reason, when an electrode terminal and a conductive member are in contact via an oxide film and are electrically connected, there is a problem that an electrical resistance at a contact portion between the electrode terminal and the conductive member is increased.

この発明は、上記従来技術に存在する問題点に着目してなされたものであり、その目的は、電極端子と導電部材とを電気的に接続する接続部の電気抵抗を低減できる蓄電装置を提供することにある。   This invention was made paying attention to the problem which exists in the said prior art, The objective is providing the electrical storage apparatus which can reduce the electrical resistance of the connection part which electrically connects an electrode terminal and a electrically-conductive member. There is to do.

上記課題を解決するために、請求項１に記載の発明は、金属箔の表面に活物質層を形成した電極が、層状に重なっており、前記金属箔のうち前記活物質層が形成されていない非形成部が層状に重なる非形成部群を有する電極組立体と、前記電極組立体と電気を授受する電極端子が設けられる端子壁を有するとともに前記電極組立体を収容するケースと、前記非形成部群と前記電極端子とを電気的に接続する導電部材と、を備えた蓄電装置であって、前記電極端子は、前記ケースの外部に突出する外部端子部と、前記ケースの内部に配設され、前記外部端子部と電気的に接続される金属製の第１接続部と、を有し、前記導電部材は、前記第１接続部と電気的に接続される金属製の第２接続部を有し、前記第１接続部、及び前記第２接続部のうち少なくとも一方には、他方に向かって突出し且つ前記他方の接続部に接触する凸部が設けられていることを要旨とする。   In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an electrode in which an active material layer is formed on the surface of a metal foil is layered, and the active material layer is formed in the metal foil. An electrode assembly having a non-formation portion group in which non-formation portions overlap each other in layers, a case having a terminal wall provided with electrode terminals for transmitting and receiving electricity to and from the electrode assembly, and housing the electrode assembly, And a conductive member electrically connecting the electrode group to the electrode group, wherein the electrode terminal is disposed outside the case and an external terminal portion protruding outside the case. A metal first connection portion that is electrically connected to the external terminal portion, and the conductive member is a metal second connection electrically connected to the first connection portion. A first connection portion and a second connection portion While the even without, the gist of the convex portion is provided in contact with the connecting portion of the projecting and the other toward the other.

これによれば、電極端子を構成する第１接続部、及び導電部材を構成する第２接続部のうち少なくとも一方の接続部には、他方の接続部に向かって突出し且つ他方の接続部に接触する凸部が形成されている。このため、凸部を他方の接続部に食い込ませるように接触させたり、凸部を他方の接続部に接触させた状態で該凸部の突出方向と直交する方向へ移動させたりすることで、凸部と他方の接続部との接触部分における酸化被膜を破り、金属の新生面を露出させることができる。このため電極端子と導電部材とを電気的に接続する接続部の電気抵抗を低減できる。   According to this, at least one of the first connection portion constituting the electrode terminal and the second connection portion constituting the conductive member protrudes toward the other connection portion and contacts the other connection portion. The convex part to be formed is formed. For this reason, by bringing the convex portion into contact with the other connecting portion, or by moving the convex portion in a direction perpendicular to the protruding direction of the convex portion while being in contact with the other connecting portion, The oxide film at the contact portion between the convex portion and the other connecting portion can be broken to expose the new metal surface. For this reason, the electrical resistance of the connection part which electrically connects an electrode terminal and a electrically-conductive member can be reduced.

請求項２に記載の発明は、請求項１に記載の蓄電装置において、前記凸部は、前記他方の接続部の表面の酸化被膜を貫通していることを要旨とする。
これによれば、凸部は他方の接合部の表面に形成された酸化被膜を貫通していることから、電極端子と導電部材とを、凸部において酸化被膜を介在させることなく接触させ、電極端子と導電部材との接続部の電気抵抗をさらに低減できる。 The invention according to claim 2 is characterized in that, in the power storage device according to claim 1, the convex portion penetrates the oxide film on the surface of the other connecting portion.
According to this, since the convex portion penetrates the oxide film formed on the surface of the other joint portion, the electrode terminal and the conductive member are brought into contact with each other without interposing the oxide film on the convex portion, and the electrode The electrical resistance of the connection portion between the terminal and the conductive member can be further reduced.

請求項３に記載の発明は、請求項１または２に記載の蓄電装置において、前記凸部は、先端が先鋭な先鋭部であることを要旨とする。これによれば、凸部の先端が先鋭であることから、凸部を他方の接続部に接触させることで酸化被膜を容易に破り、金属の新生面を露出させることができる。   A third aspect of the present invention is the power storage device according to the first or second aspect, wherein the convex portion is a sharp portion with a sharp tip. According to this, since the tip of the convex portion is sharp, the oxide film can be easily broken by exposing the convex portion to the other connecting portion, and the new metal surface can be exposed.

請求項４に記載の発明は、請求項１〜３のいずれか１項に記載の蓄電装置において、前記他方の接続部には、表面を削り取った削り面が形成されていることを要旨とする。これによれば、新生面の形成面積を広くすることにより、凸部と他方の接続部とを酸化被膜を介在させることなくより確実に接触させ、電極端子と導電部材とを電気的に接続する接続部の電気抵抗をより低減できる。   The invention according to claim 4 is characterized in that, in the power storage device according to any one of claims 1 to 3, the surface of the other connecting portion is formed with a shaved surface. . According to this, by increasing the formation area of the new surface, the projection and the other connection part are more reliably brought into contact without interposing an oxide film, and the electrode terminal and the conductive member are electrically connected. The electrical resistance of the part can be further reduced.

請求項５に記載の発明は、請求項１〜４のいずれか１項に記載の蓄電装置において、前記導電部材は、金属製の板状部材であり、前記凸部は、前記板状部材が屈曲して突出した屈曲部であることを要旨とする。   The power storage device according to any one of claims 1 to 4, wherein the conductive member is a metal plate member, and the convex portion is the plate member. The gist is that the bent portion is bent and protruded.

これによれば、凸部は、弾性を有する金属製の板状部材を屈曲させて形成されている。このため、凸部の突出方向に沿った第１接続部と第２接続部との間の距離が変動する場合であっても、凸部が弾性変形することにより、凸部と他方の接続部とが離間することを抑制できる。   According to this, the convex part is formed by bending a metal plate-like member having elasticity. For this reason, even if the distance between the 1st connection part and the 2nd connection part along the protrusion direction of a convex part is fluctuate | varied, a convex part and the other connection part are elastically deformed. Can be prevented from separating.

請求項６に記載の発明は、請求項１〜５のいずれか１項に記載の蓄電装置において、前記蓄電装置は二次電池であること要旨とする。これによれば、二次電池として、電極端子と導電部材とを電気的に接続する接続部の電気抵抗を低減できる。   The invention according to claim 6 is the power storage device according to any one of claims 1 to 5, wherein the power storage device is a secondary battery. According to this, the electrical resistance of the connection part which electrically connects an electrode terminal and an electroconductive member as a secondary battery can be reduced.

本発明によれば、電極端子と導電部材とを電気的に接続する接続部の電気抵抗を低減できる。   ADVANTAGE OF THE INVENTION According to this invention, the electrical resistance of the connection part which electrically connects an electrode terminal and a electrically-conductive member can be reduced.

リチウムイオン二次電池を模式的に示す断面図。Sectional drawing which shows a lithium ion secondary battery typically. 部分的に分解したリチウムイオン二次電池を模式的に示す斜視図。The perspective view which shows typically the lithium ion secondary battery decomposed | disassembled partially. 分解した電極組立体を模式的に示す斜視図。The perspective view which shows typically the decomposed | disassembled electrode assembly. リチウムイオン二次電池を拡大して模式的に示す断面図。Sectional drawing which expands and shows a lithium ion secondary battery typically. 分解した正極端子を模式的に示す斜視図。The perspective view which shows typically the decomposed | disassembled positive electrode terminal. （ａ）及び（ｂ）は、リチウムイオン二次電池を拡大して模式的に示す断面図。(A) And (b) is sectional drawing which expands and shows typically a lithium ion secondary battery. （ａ）は、第２の実施形態における導電部材の一部を模式的に示す下面図、（ｂ）は、（ａ）に示す１−１線断面図。(A) is the bottom view which shows typically a part of electrically-conductive member in 2nd Embodiment, (b) is the 1-1 sectional view taken on the line shown to (a). （ａ）及び（ｂ）は、第２の実施形態におけるリチウムイオン二次電池を拡大して模式的に示す断面図。(A) And (b) is sectional drawing which expands and shows typically the lithium ion secondary battery in 2nd Embodiment. （ａ）及び（ｂ）は、別の実施形態における導電部材を模式的に示す斜視図。(A) And (b) is a perspective view which shows typically the electrically-conductive member in another embodiment.

（第１の実施形態）
以下、本発明を具体化した第１の実施形態を図１〜図６にしたがって説明する。
図１に示すように、例えば乗用車両や産業車両などの車両に搭載される蓄電装置としてのリチウムイオン二次電池（以下「二次電池」と示す）１０は、ケース１１に電極組立体１２が収容されている。 (First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, for example, a lithium ion secondary battery (hereinafter referred to as “secondary battery”) 10 as a power storage device mounted on a vehicle such as a passenger vehicle or an industrial vehicle includes a case 11 and an electrode assembly 12. Contained.

図２に示すように、ケース１１は、電極組立体１２を収容する有底四角箱状の本体部材１３と、該本体部材１３の開口部を閉塞する四角板状の蓋部材１４とから構成されている。本体部材１３、及び蓋部材１４は、例えばステンレスやアルミニウムなどの金属製である。   As shown in FIG. 2, the case 11 includes a bottomed square box-shaped main body member 13 that houses the electrode assembly 12, and a square plate-shaped lid member 14 that closes the opening of the main body member 13. ing. The main body member 13 and the lid member 14 are made of a metal such as stainless steel or aluminum.

本体部材１３は、矩形板状の底壁１３ａと、底壁１３ａの４つの縁部からそれぞれ立設された矩形板状の第１側壁１３ｂ、第２側壁１３ｃ、第３側壁１３ｄ、及び第４側壁１３ｅとから形成されている。   The main body member 13 includes a rectangular plate-shaped bottom wall 13a, a rectangular plate-shaped first side wall 13b, a second side wall 13c, a third side wall 13d, and a fourth side wall that are erected from four edges of the bottom wall 13a. The side wall 13e is formed.

図１に示すように、第１側壁１３ｂには、該第１側壁１３ｂの内面と外面とを連通する連通孔１３ｆが設けられている。また、第１側壁１３ｂには、電極端子としての正極端子１５、及び電極端子としての負極端子１６が設けられている。なお、正極端子１５、及び負極端子１６の詳細については後述する。本実施形態の第１側壁１３ｂは、電極端子が設けられる端子壁となる。   As shown in FIG. 1, the first side wall 13b is provided with a communication hole 13f that communicates the inner surface and the outer surface of the first side wall 13b. Moreover, the positive electrode terminal 15 as an electrode terminal and the negative electrode terminal 16 as an electrode terminal are provided in the 1st side wall 13b. Details of the positive terminal 15 and the negative terminal 16 will be described later. The 1st side wall 13b of this embodiment turns into a terminal wall in which an electrode terminal is provided.

図３に示すように、電極組立体１２は、電極としての正極シート１８と、正極シート１８とは極性が異なる電極としての負極シート１９と、正極シート１８と負極シート１９との間を絶縁する矩形シート状のセパレータ２０とを有する。そして、電極組立体１２は、複数の正極シート１８、及び複数の負極シート１９を、間にセパレータ２０を介在させた状態で交互に層状に重なるように積層された積層型の電極組立体である。以下の説明で、単に「積層方向（重なり方向）」と示す場合は、電極組立体１２における正極シート１８、及び負極シート１９の積層方向（重なり方向）を意味するものとする。   As shown in FIG. 3, the electrode assembly 12 insulates the positive electrode sheet 18 as an electrode, the negative electrode sheet 19 as an electrode having a polarity different from that of the positive electrode sheet 18, and the positive electrode sheet 18 and the negative electrode sheet 19. And a rectangular sheet-like separator 20. The electrode assembly 12 is a stacked electrode assembly in which a plurality of positive electrode sheets 18 and a plurality of negative electrode sheets 19 are stacked so as to be alternately layered with a separator 20 interposed therebetween. . In the following description, the simple “stacking direction (overlapping direction)” means the stacking direction (overlapping direction) of the positive electrode sheet 18 and the negative electrode sheet 19 in the electrode assembly 12.

図３に示すように、正極シート１８は、正極用の金属箔（本実施形態ではアルミニウム箔）２１と、その両面に正極活物質を塗布して形成された正極活物質層２２を有する。また、正極活物質層２２が形成されていない部分の金属箔２１は、非形成部としての非塗工部２３を構成する。そして、正極シート１８の縁部１８ａには、正極集電タブ２４が突出形成されている。正極集電タブ２４は、非塗工部２３を構成する金属箔２１の一部である。   As shown in FIG. 3, the positive electrode sheet 18 includes a positive electrode metal foil (aluminum foil in this embodiment) 21 and a positive electrode active material layer 22 formed by applying a positive electrode active material on both surfaces thereof. The portion of the metal foil 21 where the positive electrode active material layer 22 is not formed constitutes a non-coated portion 23 as a non-formed portion. A positive electrode current collecting tab 24 is formed to protrude from the edge 18 a of the positive electrode sheet 18. The positive electrode current collecting tab 24 is a part of the metal foil 21 constituting the non-coated portion 23.

正極集電タブ２４は、電極組立体１２を構成する各正極シート１８において同位置に同一形状で形成されている。このため、図１に示すように、電極組立体１２において積層方向に沿って延びる４つの縁部のうち、第１側壁１３ｂと互いに対向する１つの縁部１２ａには、複数の正極集電タブ２４が層状に重なった非形成部群としての正極集電タブ群２４ａが突出形成される。   The positive electrode current collecting tab 24 is formed in the same position and in the same shape in each positive electrode sheet 18 constituting the electrode assembly 12. Therefore, as shown in FIG. 1, among the four edge portions extending along the stacking direction in the electrode assembly 12, a plurality of positive electrode current collecting tabs are provided on one edge portion 12 a facing the first side wall 13 b. A positive electrode current collecting tab group 24a as a non-formed part group in which 24 is layered is formed to protrude.

また、負極シート１９は、負極用の金属箔（本実施形態では銅箔）２５と、その両面に負極活物質を塗布して形成された負極活物質層２６を有する。また、負極活物質層２６が形成されていない部分の金属箔２５は、非形成部としての非塗工部２７を構成する。そして、負極シート１９の縁部１９ａには、負極集電タブ２８が突出形成されている。負極集電タブ２８は、非塗工部２７を構成する金属箔２５の一部である。   Further, the negative electrode sheet 19 includes a negative electrode metal foil (copper foil in this embodiment) 25 and a negative electrode active material layer 26 formed by applying a negative electrode active material on both surfaces thereof. The portion of the metal foil 25 where the negative electrode active material layer 26 is not formed constitutes a non-coated portion 27 as a non-formed portion. A negative electrode current collecting tab 28 is formed so as to protrude from the edge 19 a of the negative electrode sheet 19. The negative electrode current collecting tab 28 is a part of the metal foil 25 constituting the non-coated portion 27.

負極集電タブ２８は、電極組立体１２を構成する各負極シート１９において同位置に同一形状で形成されている。なお、負極集電タブ２８は、正極シート１８と負極シート１９を積層する場合に正極集電タブ２４と重ならない位置に設けられている。このため、図１に示すように、電極組立体１２の縁部１２ａには、正極集電タブ群２４ａとは異なる部分に、複数の負極集電タブ２８が層状に重なった非形成部群としての負極集電タブ群２８ａが突出形成されている。   The negative electrode current collecting tab 28 is formed in the same position and in the same shape in each negative electrode sheet 19 constituting the electrode assembly 12. The negative electrode current collecting tab 28 is provided at a position that does not overlap the positive electrode current collecting tab 24 when the positive electrode sheet 18 and the negative electrode sheet 19 are laminated. For this reason, as shown in FIG. 1, the edge portion 12a of the electrode assembly 12 is formed as a non-formed portion group in which a plurality of negative electrode current collecting tabs 28 are layered on a portion different from the positive electrode current collecting tab group 24a. The negative electrode current collecting tab group 28a is formed to protrude.

そして、正極集電タブ群２４ａには、該正極集電タブ群２４ａと正極端子１５とを電気的に接続する導電部材としての正極導電部材３０が溶接などにより接合され、電気的に接続されている。正極導電部材３０は、金属製（本実施形態ではアルミニウム製）である。また、負極集電タブ群２８ａには、該負極集電タブ群２８ａと負極端子１６とを電気的に接続する導電部材としての負極導電部材３１が溶接などにより接合され、電気的に接続されている。負極導電部材３１は、金属製（本実施形態では銅製）である。正極導電部材３０は電極組立体１２と正極端子１５とを電気的に接続され、また、負極導電部材３１は電極組立体１２と負極端子１６とを電気的に接続されることで、正極端子１５、及び負極端子１６は、電極組立体１２との間で電気の授受が可能となる。   A positive electrode conductive member 30 as a conductive member for electrically connecting the positive electrode current collector tab group 24a and the positive electrode terminal 15 is joined to and electrically connected to the positive electrode current collector tab group 24a by welding or the like. Yes. The positive electrode conductive member 30 is made of metal (in this embodiment, made of aluminum). In addition, a negative electrode conductive member 31 as a conductive member for electrically connecting the negative electrode current collector tab group 28a and the negative electrode terminal 16 is joined to and electrically connected to the negative electrode current collector tab group 28a by welding or the like. Yes. The negative electrode conductive member 31 is made of metal (in the present embodiment, copper). The positive electrode conductive member 30 is electrically connected to the electrode assembly 12 and the positive electrode terminal 15, and the negative electrode conductive member 31 is electrically connected to the electrode assembly 12 and the negative electrode terminal 16. The negative electrode terminal 16 can exchange electricity with the electrode assembly 12.

各導電部材３０，３１は、電極組立体１２の縁部１２ａに沿って延びる長方形の薄板状部材である。正極導電部材３０において、正極集電タブ群２４ａと接合される基端部とは他方側の第２接続部としての先端部３０ａには、貫通孔３０ｂが形成されている。同様に、負極導電部材３１において、負極集電タブ群２８ａと接合される基端部とは反対側の先端部３１ａには、貫通孔３１ｂが形成されている。   Each conductive member 30, 31 is a rectangular thin plate member extending along the edge 12 a of the electrode assembly 12. In the positive electrode conductive member 30, a through hole 30b is formed in a distal end portion 30a as a second connection portion on the other side of the base end portion joined to the positive electrode current collecting tab group 24a. Similarly, in the negative electrode conductive member 31, a through hole 31b is formed at a distal end portion 31a opposite to a base end portion joined to the negative electrode current collecting tab group 28a.

次に、正極端子１５、及び負極端子１６について説明する。なお、本実施形態の負極端子１６は、正極端子１５と同様であることから、その詳細な説明を省略する。
図４及び図５に示すように、正極端子１５は、ケース１１の外部に突出する金属製（本実施形態ではアルミニウム）の外部端子部としての外部端子部材３２と、ケース１１の内部に配設され、外部端子部材３２と電気的に接続される金属製（本実施形態ではアルミニウム）の第１接続部としての締結部材３３を有している。なお、負極端子１６を構成する外部端子部材３２、及び締結部材３３は銅製である。また、正極端子１５は、正極導電部材３０、外部端子部材３２、及び締結部材３３をケース１１と絶縁するための絶縁部材３５を有している。 Next, the positive electrode terminal 15 and the negative electrode terminal 16 will be described. In addition, since the negative electrode terminal 16 of this embodiment is the same as that of the positive electrode terminal 15, the detailed description is abbreviate | omitted.
As shown in FIGS. 4 and 5, the positive electrode terminal 15 is disposed inside the case 11 and an external terminal member 32 as an external terminal portion made of metal (aluminum in the present embodiment) protruding outside the case 11. And a fastening member 33 as a first connection portion made of metal (aluminum in the present embodiment) electrically connected to the external terminal member 32. The external terminal member 32 and the fastening member 33 constituting the negative electrode terminal 16 are made of copper. The positive terminal 15 has an insulating member 35 for insulating the positive electrode conductive member 30, the external terminal member 32, and the fastening member 33 from the case 11.

ここで、正極導電部材３０において、電極組立体１２の縁部１２ａと対向する面は、締結部材３３と接触して電気的に接続される第１接触面３０ｃとされている一方で、第１側壁１３ｂと対向する面は、絶縁部材３５と接触して第１側壁１３ｂ（本体部材１３）から絶縁される第２接触面３０ｄとされている。   Here, in the positive electrode conductive member 30, the surface facing the edge portion 12 a of the electrode assembly 12 is a first contact surface 30 c that is in contact with and electrically connected to the fastening member 33. The surface facing the side wall 13b is a second contact surface 30d that is in contact with the insulating member 35 and insulated from the first side wall 13b (main body member 13).

そして、締結部材３３は、正極導電部材３０の電極組立体１２側に配設されるとともに、正極導電部材３０の第１接触面３０ｃと対向する対向面３３ａを有する四角ブロック状の締結部３３ｂを有する。対向面３３ａの中央には、内面に雌ネジが形成された筒状（本実施形態では角筒状）の係止部３３ｃが外部端子部材３２側に向かって突設されている。   The fastening member 33 is disposed on the electrode assembly 12 side of the positive electrode conductive member 30 and has a square block-like fastening portion 33b having a facing surface 33a facing the first contact surface 30c of the positive electrode conductive member 30. Have. At the center of the facing surface 33a, a cylindrical (in this embodiment, rectangular tube-shaped) locking portion 33c having an internal thread formed on the inner surface protrudes toward the external terminal member 32 side.

また、対向面３３ａには、正極導電部材３０（先端部３０ａ）に向かって突出し且つ正極導電部材３０に接触する凸部３６が設けられている。凸部３６は、対向面３３ａにおいて係止部３３ｃを囲う円環状（同心円状）に形成されているとともに、係止部３３ｃ側の第１凸部面３６ａと反対側（外側）の第２凸部面３６ｂとの交わる角度が鋭角である先鋭な先鋭部である。   The opposing surface 33 a is provided with a convex portion 36 that protrudes toward the positive electrode conductive member 30 (tip portion 30 a) and contacts the positive electrode conductive member 30. The convex portion 36 is formed in an annular shape (concentric circle) surrounding the locking portion 33c on the opposing surface 33a, and the second convexity on the opposite side (outside) from the first convex surface 36a on the locking portion 33c side. It is a sharp pointed portion having an acute angle with the surface 36b.

また、絶縁部材３５は、中央に貫通孔３５ｂが設けられた四角薄板状の天板３５ａを有する。天板３５ａは、第１側壁１３ｂの連通孔１３ｆと、貫通孔３５ｂとを一致させた状態で第１側壁１３ｂに組み付けられている。天板３５ａには、第１側壁１３ｂの内面と面接触する第１絶縁接触面３５ｃが形成されているとともに、第１絶縁接触面３５ｃの反対側には、第２接触面３０ｄと面接触する第２絶縁接触面３５ｅが形成されている。   The insulating member 35 has a rectangular thin plate-like top plate 35a provided with a through hole 35b in the center. The top plate 35a is assembled to the first side wall 13b in a state where the communication hole 13f of the first side wall 13b and the through hole 35b are aligned. The top plate 35a is formed with a first insulating contact surface 35c in surface contact with the inner surface of the first side wall 13b, and in surface contact with the second contact surface 30d on the opposite side of the first insulating contact surface 35c. A second insulating contact surface 35e is formed.

また、天板３５ａの縁部には、電極組立体１２の積層方向の両側に配置される底壁１３ａ、及び蓋部材１４、並びに電極組立体１２の縁部に沿って延びる第４側壁１３ｅに沿って垂下する四角薄板状の絶縁壁３５ｄが設けられている。   Further, at the edge of the top plate 35a, a bottom wall 13a disposed on both sides of the electrode assembly 12 in the stacking direction, a lid member 14, and a fourth side wall 13e extending along the edge of the electrode assembly 12 are provided. A rectangular thin plate-like insulating wall 35d that hangs down is provided.

また、外部端子部材３２は、円盤状の円盤部３２ａを有する。円盤部３２ａにおける本体部材１３側の面には、締結部材３３に向かって円柱状の第１雄ネジ３２ｂが突設（垂下）されている一方で、本体部材１３とは反対側の面には、円柱状の第２雄ネジ３２ｃが突設されている。なお、円盤部３２ａと第１側壁１３ｂとは、円盤部３２ａと第１側壁１３ｂとの間に配置された円環状の絶縁部材３７、及びＯリング３８によって絶縁されている。   The external terminal member 32 has a disk-shaped disk portion 32a. On the surface of the disk portion 32a on the main body member 13 side, a cylindrical first male screw 32b projects (hangs down) toward the fastening member 33, while on the surface opposite to the main body member 13 A cylindrical second male screw 32c is projected. In addition, the disk part 32a and the 1st side wall 13b are insulated by the annular | circular shaped insulating member 37 and the O-ring 38 which are arrange | positioned between the disk part 32a and the 1st side wall 13b.

そして、図４に示すように、係止部３３ｃは、正極導電部材３０の貫通孔３０ｂ、及び絶縁部材３５の貫通孔３５ｂに挿通されるとともに、係止部３３ｃの雌ネジには、外部端子部材３２の第１雄ネジ３２ｂが螺入されている。これにより、締結部材３３と外部端子部材３２とが電気的に接続されている。また、正極導電部材３０は、第２雄ネジ３２ｃの螺入に伴って生じる締結力（締め付け力）によって、天板３５ａ（第２絶縁接触面３５ｅ）と、締結部材３３（対向面３３ａ）との間に挟持され、これにより本体部材１３に固定されている。   As shown in FIG. 4, the locking portion 33 c is inserted into the through hole 30 b of the positive electrode conductive member 30 and the through hole 35 b of the insulating member 35, and an external terminal is connected to the female screw of the locking portion 33 c. A first male screw 32b of the member 32 is screwed. Thereby, the fastening member 33 and the external terminal member 32 are electrically connected. Further, the positive electrode conductive member 30 has a top plate 35a (second insulating contact surface 35e), a fastening member 33 (opposing surface 33a), and a fastening force (clamping force) generated when the second male screw 32c is screwed. And are fixed to the main body member 13 by this.

ここで、図４において拡大して示すように、金属製（本実施形態ではアルミニウム製）の正極導電部材３０、及び締結部材３３の表面には、酸化被膜（不動態被膜）４０が形成されている（薄墨色に着色して示す）。この酸化被膜４０は、アルミニウムの酸化物からなり、アルミニウムと比較して導電率が低い。   Here, as shown in an enlarged view in FIG. 4, an oxide film (passive film) 40 is formed on the surfaces of the positive electrode conductive member 30 made of metal (made of aluminum in this embodiment) and the fastening member 33. Yes (colored in light ink) The oxide film 40 is made of an oxide of aluminum and has a lower conductivity than aluminum.

そして、本実施形態の凸部３６は、正極導電部材３０の酸化被膜４０を貫通しているとともに、凸部３６の表面には酸化被膜４０が形成されていない。そして、凸部３６は、正極導電部材３０（先端部３０ａ）に食い込み、その全体が正極導電部材３０に埋入（埋設）されている。したがって、正極導電部材３０と締結部材３３とは、凸部３６において酸化被膜４０を介在させることなく接触し、電気的に接続されている。なお、第１接触面３０ｃと対向面３３ａとは、凸部３６の形成部分を除いて、酸化被膜４０を間に介在させた状態で面接触している。   And the convex part 36 of this embodiment penetrates the oxide film 40 of the positive electrode conductive member 30, and the oxide film 40 is not formed on the surface of the convex part 36. And the convex part 36 bites into the positive electrode conductive member 30 (tip part 30a), and the whole is embedded (embedded) in the positive electrode conductive member 30. Therefore, the positive electrode conductive member 30 and the fastening member 33 are in contact with each other without interposing the oxide film 40 at the convex portion 36 and are electrically connected. In addition, the 1st contact surface 30c and the opposing surface 33a are surface-contacting in the state which interposed the oxide film 40 except the formation part of the convex part 36. FIG.

次に、上記のように構成した二次電池１０の作用について説明する。
図４に示すように、凸部３６は、正極導電部材３０の酸化被膜４０を貫通しているとともに、凸部３６の表面には酸化被膜４０が形成されていない。このため、凸部３６によって、正極導電部材３０と締結部材３３との間における導電経路Ｙが酸化被膜４０を介することなく形成される。したがって、酸化被膜４０が介在した状態で正極導電部材３０と締結部材３３とを接触させ、電気的に接続する構成と比較して、正極導電部材３０と締結部材３３とを電気的に接続する接続部の電気抵抗を好適に低減できる。なお、負極端子１６と負極導電部材３１との締結についても同様である。 Next, the operation of the secondary battery 10 configured as described above will be described.
As shown in FIG. 4, the convex portion 36 penetrates the oxide film 40 of the positive electrode conductive member 30, and the oxide film 40 is not formed on the surface of the convex portion 36. For this reason, the conductive path Y between the positive electrode conductive member 30 and the fastening member 33 is formed by the convex portion 36 without the oxide film 40 interposed therebetween. Therefore, compared to the configuration in which the positive electrode conductive member 30 and the fastening member 33 are brought into contact with each other and electrically connected in a state where the oxide film 40 is interposed, the positive conductive member 30 and the fastening member 33 are electrically connected. The electrical resistance of the part can be suitably reduced. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

次に、正極端子１５と正極導電部材３０との締結方法（二次電池１０の製造方法）について、図６（ａ）及び図６（ｂ）にしたがって説明する。なお、負極端子１６と負極導電部材３１との締結方法は、正極端子１５と正極導電部材３０との締結方法と同様であるので、その説明を省略する。   Next, a fastening method (a manufacturing method of the secondary battery 10) between the positive electrode terminal 15 and the positive electrode conductive member 30 will be described with reference to FIGS. 6 (a) and 6 (b). In addition, since the fastening method of the negative electrode terminal 16 and the negative electrode electrically-conductive member 31 is the same as the fastening method of the positive electrode terminal 15 and the positive electrode electrically-conductive member 30, the description is abbreviate | omitted.

図６（ａ）に示すように、連通孔１３ｆと貫通孔３５ｂとを一致させるように、第１側壁１３ｂに絶縁部材３５を組み付ける。次に、貫通孔３０ｂ、及び貫通孔３５ｂの順に締結部材３３の係止部３３ｃを挿通させる一方で、絶縁部材３７及びＯリング３８に外部端子部材３２の第１雄ネジ３２ｂを挿通させる。そして、係止部３３ｃの雌ネジに第１雄ネジ３２ｂを螺入させることにより、締結部材３３と絶縁部材３５との間に正極導電部材３０を挟持させる。   As shown in FIG. 6A, the insulating member 35 is assembled to the first side wall 13b so that the communication hole 13f and the through hole 35b are aligned. Next, the engaging portion 33c of the fastening member 33 is inserted in the order of the through hole 30b and the through hole 35b, while the first male screw 32b of the external terminal member 32 is inserted through the insulating member 37 and the O-ring 38. Then, the positive electrode conductive member 30 is sandwiched between the fastening member 33 and the insulating member 35 by screwing the first male screw 32b into the female screw of the locking portion 33c.

このとき、図６（ａ）で拡大して示すように、正極導電部材３０の表面には、その全体に酸化被膜４０が形成されている。また、締結部材３３の表面には、凸部３６を含めて、その全体に酸化被膜４０が形成されている。   At this time, as shown in an enlarged view in FIG. 6A, an oxide film 40 is formed on the entire surface of the positive electrode conductive member 30. Further, an oxide film 40 is formed on the entire surface of the fastening member 33 including the convex portion 36.

そして、図６（ｂ）に示すように、係止部３３ｃの雌ネジに第１雄ネジ３２ｂをさらに螺入させることで生じる締結力により、締結部材３３が第１側壁１３ｂ側へ移動される。これに伴って、凸部３６は、正極導電部材３０（先端部３０ａ）に対して、該正極導電部材３０の酸化被膜４０を破りつつ食い込むとともに、同時に凸部３６の酸化被膜４０が削り取られる。   Then, as shown in FIG. 6B, the fastening member 33 is moved toward the first side wall 13b by the fastening force generated by further screwing the first male screw 32b into the female screw of the locking portion 33c. . Along with this, the convex portion 36 bites into the positive electrode conductive member 30 (tip portion 30a) while breaking the oxide film 40 of the positive electrode conductive member 30, and at the same time, the oxide film 40 of the convex portion 36 is scraped off.

このため、正極導電部材３０と凸部３６との接触部において、正極導電部材３０、及び凸部３６の表面には、酸化被膜４０を有さない新生面が形成されるとともに、該新生面同士が接触（当接）される。これにより、正極導電部材３０と締結部材３３とが、酸化被膜４０を介在させることなく電気的に接続される。なお、このとき、第１接触面３０ｃと対向面３３ａとは、凸部３６の形成部分を除いて、酸化被膜４０を間に介在させた状態で面接触される。   For this reason, in the contact part of the positive electrode conductive member 30 and the convex part 36, while forming the new surface which does not have the oxide film 40 in the surface of the positive electrode conductive member 30 and the convex part 36, these new surfaces contact each other (Contact). Thereby, the positive electrode conductive member 30 and the fastening member 33 are electrically connected without interposing the oxide film 40. At this time, the first contact surface 30c and the facing surface 33a are in surface contact with the oxide film 40 interposed therebetween except for the portion where the convex portion 36 is formed.

したがって、本実施形態によれば、以下のような効果を得ることができる。
（１）正極端子１５を構成する締結部材３３には、正極導電部材３０に向かって突出し且つ正極導電部材３０に接触する凸部３６が形成されている。このため、凸部３６を正極導電部材３０に食い込ませるように接触させることで、凸部３６と正極導電部材３０との接触部分における酸化被膜４０を破り、金属の新生面を露出させることができる。このため正極端子１５と正極導電部材３０とを電気的に接続する接続部の電気抵抗を低減できる。負極端子１６と負極導電部材３１との締結についても同様である。 Therefore, according to the present embodiment, the following effects can be obtained.
(1) The fastening member 33 constituting the positive electrode terminal 15 is formed with a convex portion 36 that protrudes toward the positive electrode conductive member 30 and contacts the positive electrode conductive member 30. For this reason, the oxide film 40 in the contact part of the convex part 36 and the positive electrode conductive member 30 can be broken, and the new metal surface can be exposed by bringing the convex part 36 into contact with the positive electrode conductive member 30. For this reason, the electrical resistance of the connection part which electrically connects the positive electrode terminal 15 and the positive electrode electrically-conductive member 30 can be reduced. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

（２）凸部３６は、正極導電部材３０の表面に形成された酸化被膜４０を貫通していることから、正極端子１５と正極導電部材３０とを、凸部３６において酸化被膜４０を介在させることなく接触させ、正極端子１５と正極導電部材３０との接続部の電気抵抗をさらに低減できる。負極端子１６と負極導電部材３１との締結についても同様である。   (2) Since the convex portion 36 penetrates the oxide film 40 formed on the surface of the positive electrode conductive member 30, the positive electrode terminal 15 and the positive electrode conductive member 30 are interposed between the oxide film 40 in the convex portion 36. The electrical resistance of the connecting portion between the positive electrode terminal 15 and the positive electrode conductive member 30 can be further reduced. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

（３）凸部３６の先端が先鋭であることから、凸部３６を正極導電部材３０に接触させることで酸化被膜４０を容易に破り、金属の新生面を露出させることができる。負極端子１６と負極導電部材３１との締結についても同様である。   (3) Since the tip of the convex portion 36 is sharp, the oxide film 40 can be easily broken by exposing the convex portion 36 to the positive electrode conductive member 30, and the new metal surface can be exposed. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

（４）そして、本実施形態では、二次電池１０として、正極端子１５と正極導電部材３０とを電気的に接続する接続部の電気抵抗を低減できる。したがって、二次電池１０としての内部抵抗が高くなったり、正極端子１５と正極導電部材３０との接続部が発熱したりすることを好適に抑制できる。負極端子１６と負極導電部材３１との締結についても同様である。   (4) In this embodiment, as the secondary battery 10, the electrical resistance of the connection portion that electrically connects the positive electrode terminal 15 and the positive electrode conductive member 30 can be reduced. Therefore, it can suppress suitably that internal resistance as the secondary battery 10 becomes high, or the connection part of the positive electrode terminal 15 and the positive electrode conductive member 30 generates heat. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

（５）正極導電部材３０の第１接触面３０ｃと、締結部材３３の対向面３３ａとは、凸部３６を除いた部分で面接触している。したがって、正極端子１５と正極導電部材３０とを電気的に接続する接続部の電気抵抗をさらに低減できる。負極端子１６と負極導電部材３１との締結についても同様である。
（第２の実施形態）
次に、本発明を具体化した第２の実施形態を図７及び図８にしたがって説明する。なお、以下の説明では、既に説明した実施形態と同一構成については同一符号を付すなどし、重複する説明を省略又は簡略化する。本実施形態では、締結部材３３に代えて各導電部材３０，３１に凸部３６が形成されている点で第１の実施形態と相違している。なお、負極導電部材３１は、正極導電部材３０と同一形状であることから、正極導電部材３０について詳しく説明し、負極導電部材３１の説明を省略する。 (5) The first contact surface 30 c of the positive electrode conductive member 30 and the facing surface 33 a of the fastening member 33 are in surface contact at a portion excluding the convex portion 36. Therefore, the electrical resistance of the connection portion that electrically connects the positive electrode terminal 15 and the positive electrode conductive member 30 can be further reduced. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.
(Second Embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS. In the following description, the same components as those described in the above embodiments are denoted by the same reference numerals, and redundant descriptions are omitted or simplified. The present embodiment is different from the first embodiment in that a convex portion 36 is formed on each conductive member 30, 31 instead of the fastening member 33. Since the negative electrode conductive member 31 has the same shape as the positive electrode conductive member 30, the positive electrode conductive member 30 will be described in detail and the description of the negative electrode conductive member 31 will be omitted.

図７（ａ）及び図７（ｂ）に示すように、正極導電部材３０の先端部３０ａには、貫通孔３０ｂの周囲をプレス加工などにより屈曲させることで、正極導電部材３０が屈曲して締結部材３３（締結部３３ｂ）に向かって突出する屈曲部である凸部３６が形成されている。凸部３６は、貫通孔３０ｂを連続的に囲う円環状（同心円状）に形成されている。   As shown in FIGS. 7A and 7B, the positive electrode conductive member 30 is bent at the tip 30a of the positive electrode conductive member 30 by bending the periphery of the through hole 30b by press working or the like. A convex portion 36 that is a bent portion protruding toward the fastening member 33 (fastening portion 33b) is formed. The convex portion 36 is formed in an annular shape (concentric shape) that continuously surrounds the through hole 30b.

また、図８（ｂ）に示すように、締結部３３ｂの対向面３３ａには、凸部３６によって表面を削り取って形成された削り面４１が形成されている。削り面４１は、対向面３３ａにおいて係止部３３ｃを中心とする円環状（同心円状）のごく浅い凹部である。そして、凸部３６の先端は、酸化被膜４０を介在させない状態で削り面４１に接している。なお、削り面４１の表面には、削り面４１と凸部３６との接触部分を除いて酸化被膜４０が形成されている。   Moreover, as shown in FIG.8 (b), the cutting surface 41 formed by scraping the surface by the convex part 36 is formed in the opposing surface 33a of the fastening part 33b. The shaving surface 41 is a very shallow concave portion in an annular shape (concentric circle shape) centering on the locking portion 33c on the facing surface 33a. And the front-end | tip of the convex part 36 is in contact with the cutting surface 41 in the state which does not interpose the oxide film 40. FIG. Note that an oxide film 40 is formed on the surface of the shaving surface 41 except for a contact portion between the shaving surface 41 and the convex portion 36.

また、凸部３６は、絶縁部材３５と締結部材３３との間において、凸部３６の突出方向、即ち第１雄ネジ３２ｂが延びる方向に、弾性変形の範囲内で圧縮されている。したがって、凸部３６の先端は、凸部３６が復元しようとする反発力により締結部材３３の対向面３３ａ（削り面４１）に当接されている。   Moreover, the convex part 36 is compressed within the range of elastic deformation between the insulating member 35 and the fastening member 33 in the protruding direction of the convex part 36, that is, the direction in which the first male screw 32b extends. Therefore, the tip of the convex portion 36 is in contact with the opposing surface 33a (the shaving surface 41) of the fastening member 33 by a repulsive force that the convex portion 36 tries to restore.

次に、上記のように構成した二次電池１０の作用について説明する。
図８（ｂ）に示すように、凸部３６の先端は、酸化被膜４０を介在させることなく締結部材３３に接触している。このため、凸部３６によって、正極導電部材３０と締結部材３３との間における導電経路Ｙが酸化被膜４０を介在させることなく形成される。したがって、本実施形態では、酸化被膜４０を介して正極導電部材３０と締結部材３３とを接触させ、電気的に接続する構成と比較して、正極導電部材３０と締結部材３３とを電気的に接続する接続部の電気抵抗を低減できる。なお、負極端子１６と負極導電部材３１との締結についても同様である。 Next, the operation of the secondary battery 10 configured as described above will be described.
As shown in FIG. 8B, the tip of the convex portion 36 is in contact with the fastening member 33 without the oxide film 40 interposed. For this reason, the conductive path Y between the positive electrode conductive member 30 and the fastening member 33 is formed by the convex portion 36 without interposing the oxide film 40. Therefore, in this embodiment, the positive electrode conductive member 30 and the fastening member 33 are electrically connected as compared with the configuration in which the positive electrode conductive member 30 and the fastening member 33 are brought into contact with each other via the oxide film 40 and are electrically connected. The electrical resistance of the connecting portion to be connected can be reduced. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

また、凸部３６は、金属製の正極導電部材３０を屈曲させた屈曲部として形成されている。このため、凸部３６は、例えば外部端子部材３２の緩みなどに起因して、絶縁部材３５の天板３５ａと締結部材３３との離間距離、換言すれば正極導電部材３０と締結部材３３との離間距離が変化する場合であっても、該離間距離に応じて凸部３６が締結部材３３に当接するように変形し、凸部３６と締結部材３３とが離間することが抑制される。   Further, the convex portion 36 is formed as a bent portion obtained by bending the metal positive electrode conductive member 30. For this reason, the convex portion 36 is caused by, for example, looseness of the external terminal member 32 or the like, a separation distance between the top plate 35 a of the insulating member 35 and the fastening member 33, in other words, between the positive electrode conductive member 30 and the fastening member 33. Even when the separation distance changes, the protrusion 36 is deformed so as to contact the fastening member 33 according to the separation distance, and the protrusion 36 and the fastening member 33 are prevented from separating.

次に、正極端子１５と正極導電部材３０との締結方法（二次電池１０の製造方法）について、図８（ａ）及び図８（ｂ）にしたがって説明する。なお、負極端子１６と負極導電部材３１との締結方法は、正極端子１５と正極導電部材３０との締結方法と同様であるので、その説明を省略する。   Next, a method for fastening the positive electrode terminal 15 and the positive electrode conductive member 30 (a method for manufacturing the secondary battery 10) will be described with reference to FIGS. 8 (a) and 8 (b). In addition, since the fastening method of the negative electrode terminal 16 and the negative electrode electrically-conductive member 31 is the same as the fastening method of the positive electrode terminal 15 and the positive electrode electrically-conductive member 30, the description is abbreviate | omitted.

図８（ａ）に示すように、貫通孔３０ｂ及び貫通孔３５ｂに係止部３３ｃを挿通させ、係止部３３ｃの雌ネジに第１雄ネジ３２ｂを螺入させた状態において、正極導電部材３０の表面には、その全体に酸化被膜４０が形成されているとともに、締結部材３３の表面には、凸部３６を含めて、その全体に酸化被膜４０が形成されている。   As shown in FIG. 8A, in the state where the engaging portion 33c is inserted into the through hole 30b and the through hole 35b and the first male screw 32b is screwed into the female screw of the engaging portion 33c, the positive electrode conductive member An oxide film 40 is formed on the entire surface of 30, and an oxide film 40 is formed on the entire surface of the fastening member 33 including the convex portion 36.

そして、図８（ｂ）に示すように、締結部材３３は、第１雄ネジ３２ｂを係止部３３ｃの雌ネジにさらに螺入させることで生じる締結力により、第１側壁１３ｂ側へ移動される。そして、凸部３６は、天板３５ａ（第２絶縁接触面３５ｅ）と締結部材３３（対向面３３ａ）との離間距離が凸部３６の厚さより狭くなると、その先端が締結部材３３に当接した状態を維持したまま弾性変形し、その厚さが小さくなる。   As shown in FIG. 8B, the fastening member 33 is moved to the first side wall 13b side by a fastening force generated by further screwing the first male screw 32b into the female screw of the locking portion 33c. The When the distance between the top plate 35a (second insulating contact surface 35e) and the fastening member 33 (opposing surface 33a) becomes narrower than the thickness of the convex portion 36, the tip of the convex portion 36 comes into contact with the fastening member 33. While maintaining this state, it is elastically deformed and its thickness is reduced.

このとき、凸部３６の先端は、締結部材３３の対向面３３ａに当接した状態のまま、貫通孔３０ｂの直径が小さくなる方向（係止部３３ｃに近接する方向）へ摺動される。このため、対向面３３ａには、凸部３６の摺動に伴って円環状の削り面４１が形成され、酸化被膜４０が削り取られるとともに、同時に凸部３６の先端部の酸化被膜４０も削り取られる。   At this time, the tip of the convex portion 36 is slid in a direction in which the diameter of the through hole 30b is reduced (a direction close to the locking portion 33c) while being in contact with the opposing surface 33a of the fastening member 33. For this reason, an annular shaving surface 41 is formed on the facing surface 33a as the convex portion 36 slides, and the oxide film 40 is scraped off. At the same time, the oxide film 40 at the tip of the convex portion 36 is also scraped off. .

このため、締結部材３３、及び凸部３６に酸化被膜４０を有さない新生面が形成されるとともに、該新生面同士が接触（当接）される。このとき、削り面４１の全体が酸化被膜４０を有さない新生面となることから、新生面が広い面積にわたって形成される。そして、正極導電部材３０と締結部材３３とが、酸化被膜４０を介在させることなく電気的に接続される。   For this reason, while the new surface which does not have the oxide film 40 is formed in the fastening member 33 and the convex part 36, these new surfaces contact (contact | abut). At this time, since the entire shaving surface 41 becomes a new surface without the oxide film 40, the new surface is formed over a wide area. The positive electrode conductive member 30 and the fastening member 33 are electrically connected without interposing the oxide film 40.

したがって、本実施形態によれば、第１の実施形態の効果（１）〜（４）に加えて、以下のような効果を得ることができる。
（６）締結部材３３の対向面３３ａには、表面を削り取った削り面４１が形成されている。これによれば、新生面の形成面積を広くすることにより、凸部３６と締結部材３３とを酸化被膜４０を介在させることなくより確実に接触させ、正極端子１５と正極導電部材３０とを電気的に接続する接続部の電気抵抗をより低減できる。負極端子１６と負極導電部材３１との締結についても同様である。 Therefore, according to this embodiment, in addition to the effects (1) to (4) of the first embodiment, the following effects can be obtained.
(6) On the facing surface 33 a of the fastening member 33, a shaving surface 41 is formed by shaving the surface. According to this, by increasing the formation area of the new surface, the convex portion 36 and the fastening member 33 are more reliably brought into contact with each other without the oxide film 40 interposed therebetween, and the positive electrode terminal 15 and the positive electrode conductive member 30 are electrically connected. It is possible to further reduce the electrical resistance of the connecting portion connected to the. The same applies to the fastening of the negative electrode terminal 16 and the negative electrode conductive member 31.

（７）凸部３６は、弾性を有する金属製の正極導電部材３０を屈曲させて形成されている。このため、凸部３６の突出方向に沿った正極導電部材３０と締結部材３３との間の距離が変動する場合であっても、凸部３６が弾性変形することにより、凸部３６と締結部材３３とが離間することを抑制できる。   (7) The convex portion 36 is formed by bending a metal positive electrode conductive member 30 having elasticity. For this reason, even if the distance between the positive electrode conductive member 30 and the fastening member 33 along the projecting direction of the convex portion 36 varies, the convex portion 36 and the fastening member are elastically deformed. 33 can be prevented from separating.

実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ 図９（ａ）、及び図９（ｂ）に示すように、凸部３６は、正極導電部材３０や負極導電部材３１に形成されていてもよい。また、凸部３６は、締結部材３３、及び正極導電部材３０の両方に形成されていてもよい。負極端子１６と負極導電部材３１との締結についても同様に変更できる。 The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 9A and FIG. 9B, the convex portion 36 may be formed on the positive electrode conductive member 30 or the negative electrode conductive member 31. Further, the convex portion 36 may be formed on both the fastening member 33 and the positive electrode conductive member 30. The fastening of the negative electrode terminal 16 and the negative electrode conductive member 31 can be similarly changed.

○ 図９（ａ）に示すように、正極導電部材３０に形成する凸部３６は、第１の実施形態のように正極導電部材３０を屈曲させないで形成した凸部としてもよい。負極端子１６と負極導電部材３１との締結についても同様に変更できる。   As shown in FIG. 9A, the convex portion 36 formed on the positive electrode conductive member 30 may be a convex portion formed without bending the positive electrode conductive member 30 as in the first embodiment. The fastening of the negative electrode terminal 16 and the negative electrode conductive member 31 can be similarly changed.

○ 凸部３６の形状を変更してもよい。例えば、図９（ｂ）に示すように、凸部３６は、プレス加工や切削加工により先鋭部を格子状に配置した形状としてもよい。また、凸部３６は、独立した複数の凸部を円環状に配置したり、正極導電部材３０が延びる方向、又は該延びる方向と直交する方向に沿って延びる凸条としたりしてもよい。負極端子１６と負極導電部材３１との締結についても同様に変更できる。   ○ The shape of the convex portion 36 may be changed. For example, as shown in FIG. 9B, the convex portion 36 may have a shape in which sharpened portions are arranged in a lattice shape by pressing or cutting. Moreover, the convex part 36 may arrange | position the several independent convex part in an annular | circular shape, or may make it the protruding item | line extended along the direction where the positive electrode electrically-conductive member 30 is extended, or the direction orthogonal to this extending direction. The fastening of the negative electrode terminal 16 and the negative electrode conductive member 31 can be similarly changed.

○ 締結部材３３に金属製の板状部を設け、該板状部を屈曲させることで屈曲部である凸部３６を形成してもよい。
○ 凸部３６は、先端に平面を有していてもよく、断面が半円状に形成されていてもよい。即ち、先鋭部でなくてもよい。 O The convex part 36 which is a bending part may be formed by providing a metal plate-like part in the fastening member 33 and bending the plate-like part.
(Circle) the convex part 36 may have a plane at the front-end | tip, and the cross section may be formed in semicircle shape. That is, it does not have to be a sharp point.

○ また、凸部３６の先端は、鈍角であってもよい。
○ 正極導電部材３０及び正極端子１５、及び負極導電部材３１及び負極端子１６のいずれかにおける凸部３６を省略してもよい。 In addition, the tip of the convex portion 36 may have an obtuse angle.
O The convex part 36 in any of the positive electrode conductive member 30 and the positive electrode terminal 15, and the negative electrode conductive member 31 and the negative electrode terminal 16 may be abbreviate | omitted.

○ 各導電部材３０，３１、外部端子部材３２、及び締結部材３３を形成する金属を変更してもよい。
○ 外部端子部材３２と締結部材３３とは、一体に形成されていてもよい。この場合、正極端子１５には、締結部材３３の対向面３３ａから柱状部を突設したリベットを設け、当該柱状部を殴打してかしめることにより、締結部材３３と絶縁部材３５との間に正極導電部材３０を挟持してもよい。負極端子１６と負極導電部材３１との締結についても同様に変更できる。 The metal forming each conductive member 30, 31, external terminal member 32, and fastening member 33 may be changed.
The external terminal member 32 and the fastening member 33 may be integrally formed. In this case, the positive terminal 15 is provided with a rivet having a columnar portion protruding from the opposing surface 33 a of the fastening member 33, and the columnar portion is beaten and caulked to thereby provide a space between the fastening member 33 and the insulating member 35. The positive electrode conductive member 30 may be sandwiched. The fastening of the negative electrode terminal 16 and the negative electrode conductive member 31 can be similarly changed.

○ 締結部材３３及び正極導電部材３０のうち、相手方の部材に凸部３６の先端が接触しておればよく、第１接触面３０ｃと対向面３３ａとが接触していなくてもよい。
○ 電極組立体１２は、正極シート１８、及び負極シート１９を帯状に形成するとともに、間に帯状のセパレータ２０を介在させた状態で捲回した捲回型の電極組立体としてもよい。 ○ Of the fastening member 33 and the positive electrode conductive member 30, it is only necessary that the tip of the convex portion 36 is in contact with the other member, and the first contact surface 30c and the facing surface 33a do not have to be in contact with each other.
The electrode assembly 12 may be a wound-type electrode assembly in which the positive electrode sheet 18 and the negative electrode sheet 19 are formed in a band shape and wound with a band-shaped separator 20 interposed therebetween.

○ 正極シート１８及び負極シート１９は、所定の厚みを有する金属板にそれぞれ活物質を塗布して形成されていてもよい。また、正極シート１８及び負極シート１９は、片面に活物質を塗布して形成されていてもよい。   The positive electrode sheet 18 and the negative electrode sheet 19 may be formed by applying an active material to a metal plate having a predetermined thickness. Moreover, the positive electrode sheet 18 and the negative electrode sheet 19 may be formed by applying an active material on one side.

○ ニッケル水素二次電池や、電気二重層キャパシタなどの蓄電装置に具体化してもよい。
○ 車両以外に用いられる蓄電装置に具体化してもよい。 O You may actualize in electrical storage apparatuses, such as a nickel hydride secondary battery and an electric double layer capacitor.
O You may actualize in the electrical storage apparatus used other than a vehicle.

１０…リチウムイオン二次電池（二次電池、蓄電装置）、１１…ケース、１２…電極組立体、１３ｂ…第１側壁（端子壁）、１５…正極端子（電極端子）、１６…負極端子（電極端子）、１８…正極シート（電極）、１９…負極シート（電極）、２１…金属箔、２２…正極活物質層（活物質層）、２３…非塗工部（非形成部）、２４…正極集電タブ、２４ａ…正極集電タブ群（非形成部群）、２５…金属箔、２６…負極活物質層（活物質層）、２７…非塗工部（非形成部）、２８…負極集電タブ、２８ａ…負極集電タブ群（非形成部群）、３０…正極導電部材（導電部材）、３０ａ…先端部（第２接続部）、３１…負極導電部材（導電部材）、３２…外部端子部材（外部端子部）、３３…締結部材（第１接続部）、３６…凸部、４０…酸化被膜、４１…削り面。   DESCRIPTION OF SYMBOLS 10 ... Lithium ion secondary battery (secondary battery, electrical storage apparatus), 11 ... Case, 12 ... Electrode assembly, 13b ... 1st side wall (terminal wall), 15 ... Positive electrode terminal (electrode terminal), 16 ... Negative electrode terminal ( Electrode terminal), 18 ... Positive electrode sheet (electrode), 19 ... Negative electrode sheet (electrode), 21 ... Metal foil, 22 ... Positive electrode active material layer (active material layer), 23 ... Non-coated part (non-formed part), 24 ... positive electrode current collecting tab, 24a ... positive electrode current collecting tab group (non-formed part group), 25 ... metal foil, 26 ... negative electrode active material layer (active material layer), 27 ... non-coated part (non-formed part), 28 ... negative electrode current collecting tab, 28a ... negative electrode current collecting tab group (non-forming part group), 30 ... positive electrode conductive member (conductive member), 30a ... tip part (second connecting part), 31 ... negative electrode conductive member (conductive member) 32 ... External terminal member (external terminal portion), 33 ... Fastening member (first connecting portion), 36 ... Convex portion, 40 ... Oxidized coating , 41 ... scraping surface.

Claims (6)

金属箔の表面に活物質層を形成した電極が、層状に重なっており、
前記金属箔のうち前記活物質層が形成されていない非形成部が層状に重なる非形成部群を有する電極組立体と、
前記電極組立体と電気を授受する電極端子が設けられる端子壁を有するとともに前記電極組立体を収容するケースと、
前記非形成部群と前記電極端子とを電気的に接続する導電部材と、を備えた蓄電装置であって、
前記電極端子は、前記ケースの外部に突出する外部端子部と、前記ケースの内部に配設され、前記外部端子部と電気的に接続される金属製の第１接続部と、を有し、
前記導電部材は、前記第１接続部と電気的に接続される金属製の第２接続部を有し、
前記第１接続部、及び前記第２接続部のうち少なくとも一方には、他方に向かって突出し且つ前記他方の接続部に接触する凸部が設けられていることを特徴とする蓄電装置。 The electrode with the active material layer formed on the surface of the metal foil is layered,
An electrode assembly having a non-formed part group in which the non-formed part in which the active material layer is not formed of the metal foil overlaps in layers,
A case having a terminal wall provided with an electrode terminal for transferring electricity to and from the electrode assembly, and housing the electrode assembly;
A power storage device comprising: a conductive member that electrically connects the non-formed part group and the electrode terminal;
The electrode terminal includes an external terminal portion protruding outside the case, and a metal first connection portion disposed inside the case and electrically connected to the external terminal portion,
The conductive member has a metal second connection portion that is electrically connected to the first connection portion,
At least one of the first connection part and the second connection part is provided with a convex part protruding toward the other and contacting the other connection part. 前記凸部は、前記他方の接続部の表面の酸化被膜を貫通している請求項１に記載の蓄電装置。   The power storage device according to claim 1, wherein the convex portion penetrates an oxide film on a surface of the other connection portion. 前記凸部は、先端が先鋭な先鋭部である請求項１または２に記載の蓄電装置。   The power storage device according to claim 1, wherein the convex portion is a sharp portion with a sharp tip. 前記他方の接続部には、表面を削り取った削り面が形成されている請求項１〜３のいずれか１項に記載の蓄電装置。   The power storage device according to any one of claims 1 to 3, wherein the other connection portion is formed with a shaved surface. 前記導電部材は、金属製の板状部材であり、
前記凸部は、前記板状部材が屈曲して突出した屈曲部である請求項１〜４のいずれか１項に記載の蓄電装置。 The conductive member is a metal plate member,
The power storage device according to claim 1, wherein the convex portion is a bent portion in which the plate-like member is bent and protruded. 前記蓄電装置は二次電池である請求項１〜５のいずれか１項に記載の蓄電装置。   The power storage device according to claim 1, wherein the power storage device is a secondary battery.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015035303A (en) * 2013-08-08 2015-02-19 株式会社豊田自動織機 Terminal structure
WO2017069421A1 (en) * 2015-10-22 2017-04-27 주식회사 엘지화학 Battery connector and battery pack including same
JP2020145045A (en) * 2019-03-05 2020-09-10 株式会社Ｇｓユアサ Power storage element

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001148238A (en) * 1999-11-19 2001-05-29 Sony Corp Secondary battery
JP2002117906A (en) * 2000-10-06 2002-04-19 Nec Corp LiMn SECONDARY BATTERY, BATTERY MANUFACTURING METHOD AND MOTOR-DRIVEN MOBILE VEHICLE
JP2003272601A (en) * 2002-03-13 2003-09-26 Sanyo Electric Co Ltd Secondary battery
JP2005259690A (en) * 2004-02-13 2005-09-22 Nok Corp Joining method and structure of terminal portion of sealing plate
JP2005268029A (en) * 2004-03-18 2005-09-29 Nissan Motor Co Ltd Conductive member and battery pack
WO2009096188A1 (en) * 2008-01-31 2009-08-06 Panasonic Corporation Secondary battery
JP2009193787A (en) * 2008-02-13 2009-08-27 Sanyo Electric Co Ltd Battery
JP2010097732A (en) * 2008-10-14 2010-04-30 Toyota Motor Corp Terminal member and method of manufacturing terminal member
JP2010146872A (en) * 2008-12-19 2010-07-01 Hitachi Vehicle Energy Ltd Flat secondary battery
JP2010205535A (en) * 2009-03-03 2010-09-16 Toyota Motor Corp Battery and battery pack
JP2011060556A (en) * 2009-09-09 2011-03-24 Toyota Motor Corp Battery pack
WO2011080988A1 (en) * 2009-12-28 2011-07-07 Ｊｍエナジー株式会社 Electrical storage device
JP2012104432A (en) * 2010-11-12 2012-05-31 Toyota Motor Corp Power storage device
WO2012077305A1 (en) * 2010-12-10 2012-06-14 パナソニック株式会社 Conducting path, semiconductor device using conducting path, and method for producing conducting path and semiconductor device
JP2012248392A (en) * 2011-05-27 2012-12-13 Toyota Motor Corp Method for joining battery terminal
JP2013161719A (en) * 2012-02-07 2013-08-19 Gs Yuasa Corp Battery

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001148238A (en) * 1999-11-19 2001-05-29 Sony Corp Secondary battery
JP2002117906A (en) * 2000-10-06 2002-04-19 Nec Corp LiMn SECONDARY BATTERY, BATTERY MANUFACTURING METHOD AND MOTOR-DRIVEN MOBILE VEHICLE
JP2003272601A (en) * 2002-03-13 2003-09-26 Sanyo Electric Co Ltd Secondary battery
JP2005259690A (en) * 2004-02-13 2005-09-22 Nok Corp Joining method and structure of terminal portion of sealing plate
JP2005268029A (en) * 2004-03-18 2005-09-29 Nissan Motor Co Ltd Conductive member and battery pack
WO2009096188A1 (en) * 2008-01-31 2009-08-06 Panasonic Corporation Secondary battery
JP2009193787A (en) * 2008-02-13 2009-08-27 Sanyo Electric Co Ltd Battery
JP2010097732A (en) * 2008-10-14 2010-04-30 Toyota Motor Corp Terminal member and method of manufacturing terminal member
JP2010146872A (en) * 2008-12-19 2010-07-01 Hitachi Vehicle Energy Ltd Flat secondary battery
JP2010205535A (en) * 2009-03-03 2010-09-16 Toyota Motor Corp Battery and battery pack
JP2011060556A (en) * 2009-09-09 2011-03-24 Toyota Motor Corp Battery pack
WO2011080988A1 (en) * 2009-12-28 2011-07-07 Ｊｍエナジー株式会社 Electrical storage device
JP2012104432A (en) * 2010-11-12 2012-05-31 Toyota Motor Corp Power storage device
WO2012077305A1 (en) * 2010-12-10 2012-06-14 パナソニック株式会社 Conducting path, semiconductor device using conducting path, and method for producing conducting path and semiconductor device
JP2012248392A (en) * 2011-05-27 2012-12-13 Toyota Motor Corp Method for joining battery terminal
JP2013161719A (en) * 2012-02-07 2013-08-19 Gs Yuasa Corp Battery

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015035303A (en) * 2013-08-08 2015-02-19 株式会社豊田自動織機 Terminal structure
WO2017069421A1 (en) * 2015-10-22 2017-04-27 주식회사 엘지화학 Battery connector and battery pack including same
KR20170047083A (en) * 2015-10-22 2017-05-04 주식회사 엘지화학 Battery Connecting Part And Battery Pack Comprising The Same
CN107925044A (en) * 2015-10-22 2018-04-17 株式会社Lg化学 Battery connection unit and the battery pack for including the battery connection unit
KR102102455B1 (en) 2015-10-22 2020-04-20 주식회사 엘지화학 Battery Connecting Part And Battery Pack Comprising The Same
US10707456B2 (en) 2015-10-22 2020-07-07 Lg Chem, Ltd. Battery connecting unit and battery pack including the same
CN107925044B (en) * 2015-10-22 2020-10-30 株式会社Lg化学 Battery connection unit and battery pack including the same
JP2020145045A (en) * 2019-03-05 2020-09-10 株式会社Ｇｓユアサ Power storage element
JP7354556B2 (en) 2019-03-05 2023-10-03 株式会社Ｇｓユアサ Energy storage element

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