JP5928536B2 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
JP5928536B2
JP5928536B2 JP2014145683A JP2014145683A JP5928536B2 JP 5928536 B2 JP5928536 B2 JP 5928536B2 JP 2014145683 A JP2014145683 A JP 2014145683A JP 2014145683 A JP2014145683 A JP 2014145683A JP 5928536 B2 JP5928536 B2 JP 5928536B2
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Prior art keywords
electrode terminal
storage device
power storage
pole column
bus bar
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JP2016024844A (en
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寛恭 西原
寛恭 西原
元章 奥田
元章 奥田
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Toyota Industries Corp
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Toyota Industries Corp
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Priority to JP2014145683A priority Critical patent/JP5928536B2/en
Priority to PCT/JP2015/067888 priority patent/WO2016009786A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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

Description

本発明は、電極端子を有する蓄電装置に関する。   The present invention relates to a power storage device having an electrode terminal.

ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、原動機となる電動機への供給電力を蓄える蓄電装置としてリチウムイオン電池などの二次電池が搭載されている。二次電池としては、例えば特許文献１に記載のものが知られている。この二次電池では、ケース内に電極組立体が収容され、電極組立体に電極端子が電気的に接続されている。電極端子は、ケースの蓋体の貫通孔を通ってケースの内部から外部に突出している。そして、特許文献１に記載の二次電池では、電極端子の先端の端面にバスバーを接触させて電極端子とバスバーとを接続することにより、二次電池同士がバスバーで接続されている。   A vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle) is equipped with a secondary battery such as a lithium ion battery as a power storage device that stores power supplied to an electric motor serving as a prime mover. As the secondary battery, for example, a battery described in Patent Document 1 is known. In this secondary battery, an electrode assembly is accommodated in a case, and electrode terminals are electrically connected to the electrode assembly. The electrode terminal protrudes from the inside of the case to the outside through the through hole of the case lid. And in the secondary battery of patent document 1, a secondary battery is connected by the bus bar by making a bus bar contact the end surface of the front-end | tip of an electrode terminal, and connecting an electrode terminal and a bus bar.

特開２０１４−１０２８９８号公報JP 2014-102898 A

ところで、電極端子とバスバーとの接触抵抗を小さくするために、電極端子とバスバーとの接触面積を大きくすることが望まれている。電極端子におけるバスバーとの接触面積を大きくするためには、例えば電極端子の先端においてバスバーと接触する端面（バスバー接触面）の平面度を高くすることが望ましい。   Incidentally, in order to reduce the contact resistance between the electrode terminal and the bus bar, it is desired to increase the contact area between the electrode terminal and the bus bar. In order to increase the contact area of the electrode terminal with the bus bar, for example, it is desirable to increase the flatness of the end surface (bus bar contact surface) that contacts the bus bar at the tip of the electrode terminal.

ここで、特許文献１に記載の二次電池では、電極端子の外周面にねじ部が形成されている。そして、電極端子をケースに固定させるために、電極端子のねじ部にケースの外側からナットが螺合されている。こうした電極端子のねじ部は、電極端子の軸方向における先端を含む所定範囲に形成されているため、ねじ部の加工によって電極端子の先端の端面に変形やバリ等が生じ、電極端子の先端の端面に位置するバスバー接触面の平面度が低下するおそれがある。   Here, in the secondary battery described in Patent Document 1, a thread portion is formed on the outer peripheral surface of the electrode terminal. In order to fix the electrode terminal to the case, a nut is screwed onto the screw portion of the electrode terminal from the outside of the case. Since the threaded portion of the electrode terminal is formed in a predetermined range including the tip in the axial direction of the electrode terminal, deformation or burring or the like occurs on the end surface of the tip of the electrode terminal due to the processing of the threaded portion. There is a possibility that the flatness of the bus bar contact surface located on the end face may be lowered.

本発明の目的は、電極端子へのねじ部の加工に伴ってバスバー接触面の平面度が低下することを抑制することができる蓄電装置を提供することにある。   The objective of this invention is providing the electrical storage apparatus which can suppress that the flatness of a bus-bar contact surface falls with the process of the thread part to an electrode terminal.

以下、上記目的を達成するための手段及びその作用効果について記載する。
上記課題を解決する蓄電装置は、電極がセパレータを介して交互に積層された電極組立体と、電極組立体が収容されているケースと、電極組立体と電気的に接続されているものであって、ケースの壁部から外部に突出している円筒状の極柱部を有した電極端子と、を備える蓄電装置である。そして、電極端子（極柱部）は、軸方向の先端に位置する端面をバスバーが面接触されるバスバー接触面としており、外周面にケースの外側からナットが螺合されるねじ部を有しており、極柱部の外周面のうち、軸方向における先端から基端に向けた所定位置までの範囲には、ねじ部が形成されていないことにより軸方向に沿った外径が一定となる非ねじ部が位置している。 In the following, means for achieving the above object and its effects are described.
A power storage device that solves the above problems includes an electrode assembly in which electrodes are alternately stacked via separators, a case in which the electrode assembly is accommodated, and an electrical connection with the electrode assembly. And an electrode terminal having a cylindrical pole post projecting outward from the wall of the case. Then, the electrode terminal (pole section) is for the bus bar contacting surface of the end surface positioned in the axial tip busbars are in surface contact, the threaded portion of the nut from the outside of the casing is screwed on the outer peripheral surface The outer diameter along the axial direction is constant because the threaded portion is not formed in the range from the distal end to the proximal end in the axial direction on the outer peripheral surface of the pole column portion. The non-threaded part is located.

上記構成によれば、非ねじ部を有することは、電極端子へのねじ部の加工の際、電極端子の軸方向における先端から基端に向けた所定位置までの範囲には、ねじ部の加工を施さないことであるため、電極端子へのねじ部の加工に伴って生じる変形やバリ等が、電極端子（極柱部）の先端の端面にまで及びにくくなる。したがって、電極端子へのねじ部の加工に伴ってバスバー接触面の平面度が低下することを抑制することができる。 According to the above configuration, having a non-threaded portion means that when the threaded portion is processed into the electrode terminal, the threaded portion is processed in a range from the distal end to the base end in the axial direction of the electrode terminal. Therefore, deformation, burrs, and the like caused by processing of the threaded portion of the electrode terminal do not easily reach the end surface of the tip of the electrode terminal (polar column portion) . Therefore, it can suppress that the flatness of a bus-bar contact surface falls with the process of the thread part to an electrode terminal.

上記構成によれば、非ねじ部が位置する部分での電極端子の外径が電極端子の軸方向に沿って一定であるため、電極端子の先端の端面の面積を最大限保持しつつ、電極端子に非ねじ部を位置させることができる。
上記蓄電装置において、前記極柱部は、軸方向における前記先端から基端に向けて延びる挿入穴を有し、この挿入穴は、前記端面に開口し該挿入穴に挿入される冶具が係合可能な係合穴と、この係合穴に連通し前記バスバーを貫通したボルトが螺合されるねじ穴とから構成されている。 According to the above Symbol configuration, since the outer diameter of the electrode terminal at a portion where the non-threaded portion is located, it is constant along the axial direction of the electrode terminals while maximally hold area of the end face of the tip of the electrode terminal, A non-screw part can be located in an electrode terminal.
In the power storage device, the pole column portion has an insertion hole extending from the distal end toward the proximal end in the axial direction, and the insertion hole is engaged with a jig that is opened in the end face and inserted into the insertion hole. It is composed of a possible engagement hole and a screw hole that is connected to the engagement hole and into which a bolt that penetrates the bus bar is screwed.

上記蓄電装置において、前記蓄電装置の好適な例としては、二次電池を挙げることができる。   In the above power storage device, a preferable example of the power storage device is a secondary battery.

本発明によれば、電極端子へのねじ部の加工に伴ってバスバー接触面の平面度が低下することを抑制することができる。   ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the flatness of a bus-bar contact surface falls with the process of the thread part to an electrode terminal.

電池モジュールの一部を示す斜視図。The perspective view which shows a part of battery module. 二次電池の外観を示す斜視図。The perspective view which shows the external appearance of a secondary battery. 二次電池の正極端子を拡大して示す断面図。Sectional drawing which expands and shows the positive electrode terminal of a secondary battery.

以下、蓄電装置を具体化した一実施形態を図１〜図３にしたがって説明する。
図１に示すように、隣り合う複数の二次電池２０がバスバー１１によって接続されることにより、電池モジュール１０が構成されている。バスバー１１は、平板状であり、ボルト１２によって各二次電池２０に固定されている。 Hereinafter, an embodiment embodying a power storage device will be described with reference to FIGS.
As shown in FIG. 1, the battery module 10 is configured by connecting a plurality of adjacent secondary batteries 20 by a bus bar 11. The bus bar 11 has a flat plate shape and is fixed to each secondary battery 20 by a bolt 12.

図２に示すように、蓄電装置としての二次電池２０は、ケース２１に電極組立体２２が収容されている。電極組立体２２は、正極活物質層を有する正極電極と、負極活物質層を有する負極電極とが、セパレータを介して交互に積層されて構成されている。また、ケース２１には、電極組立体２２とともに電解液も収容されている。ケース２１は、有底筒状のケース本体２３と、ケース本体２３に電極組立体２２を挿入する開口部を閉塞する平板状の蓋体２４とから構成されている。ケース本体２３と蓋体２４とは、何れも金属製（例えば、ステンレス製やアルミニウム製）である。また、この実施形態の二次電池２０は、リチウムイオン電池である。   As shown in FIG. 2, in the secondary battery 20 as the power storage device, an electrode assembly 22 is accommodated in a case 21. The electrode assembly 22 is configured by alternately stacking a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer via a separator. In addition, the case 21 contains an electrolyte solution together with the electrode assembly 22. The case 21 includes a bottomed cylindrical case body 23 and a flat lid body 24 that closes an opening for inserting the electrode assembly 22 into the case body 23. Both the case main body 23 and the lid body 24 are made of metal (for example, made of stainless steel or aluminum). Moreover, the secondary battery 20 of this embodiment is a lithium ion battery.

電極組立体２２には、電極端子としての負極端子２６及び正極端子２７が電気的に接続されている。以下、図３を参照して端子２６，２７について説明する。なお、以下では正極端子２７の構成について説明するが、正極端子２７を負極端子２６に読みかえれば、以下の説明は負極端子２６についての説明となる。   A negative electrode terminal 26 and a positive electrode terminal 27 as electrode terminals are electrically connected to the electrode assembly 22. Hereinafter, the terminals 26 and 27 will be described with reference to FIG. In the following, the configuration of the positive electrode terminal 27 will be described. However, if the positive electrode terminal 27 is replaced with the negative electrode terminal 26, the following description is for the negative electrode terminal 26.

図３に示すように、正極端子２７は、板状の基部３１と、基部３１の中央から立設する円筒状の極柱部３２と、を有している。基部３１は、ケース２１内に位置しており、極柱部３２はケース２１外に向けて基部３１から突出している。具体的には、極柱部３２は、壁部としての蓋体２４に設けられた貫通孔２５を貫通してケース２１の外部に突出している。そして、蓋体２４における貫通孔２５の内周面と極柱部３２の外周面との間に、ケース２１から正極端子２７を絶縁するための絶縁リング２８が取り付けられている。   As shown in FIG. 3, the positive electrode terminal 27 includes a plate-like base portion 31 and a cylindrical pole column portion 32 erected from the center of the base portion 31. The base portion 31 is located in the case 21, and the pole column portion 32 protrudes from the base portion 31 toward the outside of the case 21. Specifically, the pole column part 32 protrudes outside the case 21 through the through hole 25 provided in the lid 24 as a wall part. An insulating ring 28 for insulating the positive electrode terminal 27 from the case 21 is attached between the inner peripheral surface of the through hole 25 and the outer peripheral surface of the pole column portion 32 in the lid 24.

極柱部３２は、外周面にねじ部としての雄ねじ部３３を有している。正極端子２７の極柱部３２の軸方向において、極柱部３２の基部３１側の端部を基端３２ａとし、基端３２ａとは反対側の端部を先端３２ｂとすると、雄ねじ部３３は、極柱部３２の先端３２ｂから基端３２ａまでの外周面のうち、先端３２ｂから基端３２ａ側に所定距離ずれた位置である所定位置から基端３２ａまでの範囲に形成されている。すなわち、極柱部３２の先端３２ｂから基端３２ａまでの外周面のうち、先端３２ｂから基端３２ａに向けた所定位置までの範囲には、雄ねじ部３３が形成されていない非ねじ部３３ａが位置している。なお、上記所定距離及び上記所定位置は、極柱部３２への雄ねじ部３３の加工に伴う変形やバリ等の影響が、極柱部３２の先端３２ｂに位置する先端面３２ｃに及ばない距離及び位置にそれぞれ設定されている。   The pole column portion 32 has a male screw portion 33 as a screw portion on the outer peripheral surface. In the axial direction of the pole column portion 32 of the positive electrode terminal 27, when the end portion on the base portion 31 side of the pole column portion 32 is a base end 32a and the end portion opposite to the base end 32a is a tip end 32b, the male screw portion 33 is Of the outer peripheral surface from the distal end 32b to the proximal end 32a of the pole column portion 32, it is formed in a range from a predetermined position, which is a position shifted by a predetermined distance from the distal end 32b to the proximal end 32a, to the proximal end 32a. That is, the non-threaded portion 33a in which the male threaded portion 33 is not formed is formed in the range from the distal end 32b to the predetermined position toward the proximal end 32a in the outer peripheral surface from the distal end 32b to the proximal end 32a of the polar column portion 32. positioned. The predetermined distance and the predetermined position are such that the influence of deformation, burrs, and the like accompanying the processing of the male thread portion 33 on the pole column portion 32 does not reach the tip surface 32c located at the tip 32b of the pole column portion 32. Each position is set.

そして、極柱部３２の雄ねじ部３３にケース２１外からナット４０を螺合することによって、正極端子２７がケース２１に固定されている。なお、本実施形態における非ねじ部３３ａは、ケース２１外においてナット４０から突出する極柱部３２の部分の外周面に位置している。また、非ねじ部３３ａが位置する部分での極柱部３２の外径は、ナット４０の内径と同程度であり、ナット４０に挿通可能な程度の外径となっている。また、本実施形態における非ねじ部３３ａが位置する部分での極柱部３２の外径は、正極端子２７の軸方向に沿って一定である。   The positive terminal 27 is fixed to the case 21 by screwing the nut 40 from the outside of the case 21 into the male threaded portion 33 of the pole column portion 32. In addition, the non-thread part 33a in this embodiment is located in the outer peripheral surface of the part of the pole column part 32 which protrudes from the nut 40 outside the case 21. Further, the outer diameter of the pole column portion 32 at the portion where the non-threaded portion 33 a is located is about the same as the inner diameter of the nut 40, and the outer diameter is such that the nut 40 can be inserted. In addition, the outer diameter of the pole column portion 32 at the portion where the non-threaded portion 33 a is located in the present embodiment is constant along the axial direction of the positive electrode terminal 27.

極柱部３２の先端３２ｂに位置する先端面３２ｃは、極柱部３２の軸方向に対して直交する方向に延びている。そして、極柱部３２は、先端面３２ｃから基部３１に向けて延びる挿入穴３４を有している。挿入穴３４は、極柱部３２の先端面３２ｃに開口する六角形状の係合穴３５と、係合穴３５よりも極柱部３２における基端３２ａ側に位置し、係合穴３５と連通するねじ穴３６と、から構成されている。係合穴３５は、極柱部３２にナット４０が螺合されるときに、極柱部３２とナット４０とが供回りしないように六角柱状の治具が挿入される穴である。また、ねじ穴３６は、内周面に雌ねじを有している。   A distal end surface 32 c located at the distal end 32 b of the polar column part 32 extends in a direction orthogonal to the axial direction of the polar column part 32. The pole column portion 32 has an insertion hole 34 that extends from the distal end surface 32 c toward the base portion 31. The insertion hole 34 is positioned on the base end 32 a side of the pole column portion 32 with respect to the hexagonal engagement hole 35 that opens to the distal end surface 32 c of the pole column portion 32, and communicates with the engagement hole 35. And a screw hole 36. The engagement hole 35 is a hole into which a hexagonal columnar jig is inserted so that the pole column 32 and the nut 40 do not rotate when the nut 40 is screwed into the pole column 32. The screw hole 36 has a female screw on the inner peripheral surface.

二次電池２０にバスバー１１を固定するときには、バスバー１１と極柱部３２の先端面３２ｃとを面接触させた状態で、バスバー１１を貫通したボルト１２をねじ穴３６に螺合する。すなわち、極柱部３２の先端面３２ｃのうち、係合穴３５の開口を除く部分が、バスバー１１と接触するバスバー接触面として機能する。   When the bus bar 11 is fixed to the secondary battery 20, the bolt 12 penetrating the bus bar 11 is screwed into the screw hole 36 in a state where the bus bar 11 and the tip end surface 32 c of the pole column portion 32 are in surface contact. That is, a portion of the tip end surface 32 c of the pole column portion 32 excluding the opening of the engagement hole 35 functions as a bus bar contact surface that contacts the bus bar 11.

次に、本実施形態の二次電池２０の作用について説明する。
端子２６，２７の極柱部３２の先端３２ｂから基端３２ａにおける外周面のうち、先端３２ｂから所定位置までの範囲に非ねじ部３３ａが位置している。このため、端子２６，２７の極柱部３２への雄ねじ部３３の加工は、先端３２ｂから基端３２ａ側に所定距離ずれた所定位置から行われる。よって、非ねじ部３３ａが存在する分、極柱部３２の先端面３２ｃには変形やバリ等が及びにくくなり、極柱部３２の先端面３２ｃの平面度が低下しにくくなる。 Next, the effect | action of the secondary battery 20 of this embodiment is demonstrated.
The non-screw part 33a is located in the range from the front end 32b to a predetermined position in the outer peripheral surface from the front end 32b to the base end 32a of the pole column part 32 of the terminals 26 and 27. For this reason, the processing of the male thread portion 33 on the pole column portion 32 of the terminals 26 and 27 is performed from a predetermined position shifted by a predetermined distance from the distal end 32b toward the proximal end 32a. Therefore, since the non-threaded portion 33a is present, the distal end surface 32c of the pole column portion 32 is less likely to be deformed or flashed, and the flatness of the distal end surface 32c of the pole column portion 32 is less likely to decrease.

二次電池２０同士をバスバー１１で接続するときには、バスバー１１を端子２６，２７の極柱部３２の先端面３２ｃに載せてボルト１２をねじ穴３６に螺合する。すると、バスバー１１は、端子２６，２７の極柱部３２における先端面３２ｃに面接触して、端子２６，２７に固定される。   When the secondary batteries 20 are connected to each other by the bus bar 11, the bus bar 11 is placed on the tip end surface 32 c of the pole column portion 32 of the terminals 26 and 27 and the bolt 12 is screwed into the screw hole 36. Then, the bus bar 11 is fixed to the terminals 26 and 27 while being in surface contact with the distal end surface 32 c of the pole column portion 32 of the terminals 26 and 27.

したがって、本実施形態によれば、以下に示す効果を得ることができる。
（１）端子２６，２７の極柱部３２の先端３２ｂから基端３２ａにおける外周面のうち、先端３２ｂから所定位置までの範囲に非ねじ部３３ａが位置している。このため、端子２６，２７の極柱部３２への雄ねじ部３３の加工に伴って、端子２６，２７の極柱部３２の先端面３２ｃの平面度が低下することを抑制することができる。よって、極柱部３２における先端３２ｂから雄ねじ部３３が形成されている場合と比較して、端子２６，２７とバスバー１１との接触面積が大きくなる。 Therefore, according to the present embodiment, the following effects can be obtained.
(1) The non-threaded portion 33a is located in a range from the distal end 32b to a predetermined position on the outer peripheral surface from the distal end 32b to the proximal end 32a of the pole column portion 32 of the terminals 26 and 27. For this reason, it can suppress that the flatness of the front end surface 32c of the pole column part 32 of the terminals 26 and 27 falls with the process of the external thread part 33 to the pole column part 32 of the terminals 26 and 27. Therefore, the contact area between the terminals 26 and 27 and the bus bar 11 is increased as compared with the case where the male screw portion 33 is formed from the tip 32 b of the pole column portion 32.

（２）非ねじ部３３ａが位置する部分での極柱部３２の外径は、端子２６，２７の極柱部３２の軸方向に沿って一定である。このため、端子２６，２７の極柱部３２における先端面３２ｃの面積を最大限保持しつつ、端子２６，２７の極柱部３２に非ねじ部３３ａを位置させることができる。   (2) The outer diameter of the pole column portion 32 at the portion where the non-threaded portion 33 a is located is constant along the axial direction of the pole column portion 32 of the terminals 26 and 27. For this reason, the non-screw part 33a can be located in the pole column part 32 of the terminals 26 and 27, maintaining the area of the front end surface 32c in the pole column part 32 of the terminals 26 and 27 to the maximum.

（３）端子２６，２７は、極柱部３２の内部に挿入穴３４が形成されている分だけ、極柱部３２の軸方向に直交する方向（径方向）における厚みが小さい。このため、端子２６，２７の極柱部３２への雄ねじ部３３の加工に伴って極柱部３２に変形が生じやすく、極柱部３２の先端面３２ｃの平面度が低下しやすい。こうして端子２６，２７の極柱部３２の先端面３２ｃの平面度が低下しやすい形態であっても、非ねじ部３３ａを設けることで、極柱部３２の先端面３２ｃの平面度の低下を抑えることができる。   (3) The terminals 26 and 27 have a small thickness in the direction (radial direction) perpendicular to the axial direction of the pole column 32 by the amount that the insertion hole 34 is formed inside the pole column 32. For this reason, the polar column portion 32 is likely to be deformed with the processing of the male threaded portion 33 on the polar column portion 32 of the terminals 26 and 27, and the flatness of the tip end surface 32 c of the polar column portion 32 is likely to be lowered. Thus, even if the flatness of the tip end surface 32c of the pole column portion 32 of the terminals 26 and 27 is likely to be lowered, the flatness of the tip end surface 32c of the pole column portion 32 can be reduced by providing the non-threaded portion 33a. Can be suppressed.

（４）正極端子２７は、母材としてアルミニウム等を用いており、防錆の目的でその表面にニッケル等のめっき加工が施されることがある。本実施形態では、正極端子２７の極柱部３２における先端３２ｂから雄ねじ部３３を形成する場合と比較して、極柱部３２の先端面３２ｃの平面度を向上させることができるため、極柱部３２の先端面３２ｃへのめっき加工をスムーズに行うことができ、正極端子２７へのめっき工程に要するコストを抑えることができる。   (4) The positive electrode terminal 27 uses aluminum or the like as a base material, and the surface thereof may be plated with nickel or the like for the purpose of rust prevention. In the present embodiment, the flatness of the tip end surface 32c of the pole post 32 can be improved as compared with the case where the male screw portion 33 is formed from the tip 32b of the pole post 32 of the positive terminal 27. The plating process on the tip surface 32c of the portion 32 can be performed smoothly, and the cost required for the plating process on the positive electrode terminal 27 can be suppressed.

なお、上記実施形態は、これを適宜変更した以下の形態にて実施することもできる。
○ 端子２６，２７の極柱部３２の雄ねじ部３３にナット４０が螺合した状態で、ナット４０の内部に位置する極柱部３２の部分の外周面に、非ねじ部３３ａの一部又は全てが位置していても良い。こうした形態によれば、ケース２１外においてナット４０から突出する極柱部３２の部分が少なくなるため、ナット４０とバスバー１１との間の隙間を小さくすることができ、その分だけ二次電池２０を小型化させることができる。 In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
○ In a state where the nut 40 is screwed into the male threaded portion 33 of the pole column 32 of the terminals 26 and 27, a part of the non-threaded portion 33a or the outer peripheral surface of the portion of the pole column 32 located inside the nut 40 All may be located. According to such a form, since the part of the pole column part 32 which protrudes from the nut 40 outside the case 21 is reduced, the gap between the nut 40 and the bus bar 11 can be reduced, and the secondary battery 20 is correspondingly reduced. Can be reduced in size.

○ 負極端子２６と正極端子２７とのいずれか一方のみが、極柱部３２に非ねじ部３３ａを有するようにしても良い。
○ 負極端子２６や正極端子２７は、ケース本体２３を構成する壁部から突出させても良い。 Only one of the negative electrode terminal 26 and the positive electrode terminal 27 may have the non-threaded portion 33 a in the pole column portion 32.
The negative electrode terminal 26 and the positive electrode terminal 27 may protrude from the wall portion that constitutes the case body 23.

○ 二次電池２０は、リチウムイオン二次電池であったが、これに限らず、他の二次電池であってもよい。要するに、正極活物質層と負極活物質層との間をイオンが移動するとともに電荷の授受を行うものであればよい。   The secondary battery 20 is a lithium ion secondary battery, but is not limited thereto, and may be another secondary battery. In short, any ion may be used as long as ions move between the positive electrode active material layer and the negative electrode active material layer and transfer charge.

○ 本発明を、電気二重層キャパシタ等の蓄電装置に具体化してもよい。   The present invention may be embodied in a power storage device such as an electric double layer capacitor.

１１…バスバー、２０…二次電池、２１…ケース、２２…電極組立体、２４…蓋体、２６…負極端子、２７…正極端子、３１…基部、３２…極柱部、３２ａ…基端、３２ｂ…先端、３２ｃ…先端面、３３…雄ねじ部、３３ａ…非ねじ部、４０…ナット。   DESCRIPTION OF SYMBOLS 11 ... Bus bar, 20 ... Secondary battery, 21 ... Case, 22 ... Electrode assembly, 24 ... Cover, 26 ... Negative electrode terminal, 27 ... Positive electrode terminal, 31 ... Base part, 32 ... Polar pole part, 32a ... Base end, 32b ... tip, 32c ... tip surface, 33 ... male screw part, 33a ... non-screw part, 40 ... nut.

Claims (3)

電極がセパレータを介して交互に積層された電極組立体と、前記電極組立体が収容されているケースと、前記電極組立体と電気的に接続されているものであって、前記ケースの壁部から外部に突出している円筒状の極柱部を有した電極端子と、を備える蓄電装置であって、
前記極柱部は、軸方向の先端に位置する端面をバスバーが面接触されるバスバー接触面としており、外周面に前記ケースの外側からナットが螺合されるねじ部を有しており、
前記極柱部の外周面のうち、軸方向における前記先端から基端に向けた所定位置までの範囲には、前記ねじ部が形成されていないことにより軸方向に沿った外径が一定となる非ねじ部が位置していることを特徴とする蓄電装置。 An electrode assembly in which electrodes are alternately stacked via separators, a case in which the electrode assembly is accommodated, and a wall portion of the case that is electrically connected to the electrode assembly An electrode terminal having a cylindrical pole post projecting from the outside, and a power storage device comprising:
The pole unit is a bus bar contact surface the end surface positioned in the axial tip busbar is surface contact, has a threaded portion which nuts from the outside is screwed in the casing to the outer peripheral surface ,
The outer diameter along the axial direction is constant because the threaded portion is not formed in a range from the distal end to the proximal end in the axial direction on the outer peripheral surface of the pole post. A power storage device, wherein the non-screw portion is located. 前記極柱部は、軸方向における前記先端から基端に向けて延びる挿入穴を有し、
前記挿入穴は、前記端面に開口し前記挿入穴に挿入される冶具が係合可能な係合穴と、前記係合穴に連通し前記バスバーを貫通したボルトが螺合されるねじ穴とから構成されている請求項１に記載の蓄電装置。 The pole portion has an insertion hole extending from the distal end to the proximal end in the axial direction;
The insertion hole includes an engagement hole that is open to the end surface and engageable with a jig that is inserted into the insertion hole, and a screw hole that is connected to the engagement hole and is screwed with a bolt that penetrates the bus bar. The power storage device according to claim 1 configured . 前記蓄電装置は二次電池である請求項１又は請求項２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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