JP2008204987A - Electricity accumulating unit - Google Patents

Electricity accumulating unit Download PDF

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JP2008204987A
JP2008204987A JP2007036088A JP2007036088A JP2008204987A JP 2008204987 A JP2008204987 A JP 2008204987A JP 2007036088 A JP2007036088 A JP 2007036088A JP 2007036088 A JP2007036088 A JP 2007036088A JP 2008204987 A JP2008204987 A JP 2008204987A
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power storage
storage element
bus bar
electrode
storage unit
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Takehiko Inoue
健彦 井上
Shusaku Kawasaki
周作 川▲崎▼
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2007036088A priority Critical patent/JP2008204987A/en
Priority to CN200880005101.0A priority patent/CN101611463B/en
Priority to PCT/JP2008/000229 priority patent/WO2008099614A1/en
Priority to EP08710383.4A priority patent/EP2110824A4/en
Priority to US12/526,535 priority patent/US8194393B2/en
Publication of JP2008204987A publication Critical patent/JP2008204987A/en
Pending legal-status Critical Current

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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)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-reliability electricity accumulating unit capable of surely holding an electricity accumulating element that has height error. <P>SOLUTION: The electricity accumulating unit comprises a plurality of electricity accumulating sections 27 that connect a first heat accumulation element 11 to lower electrodes 15 in a second electricity accumulation element 17 using a lower bus bar 25; a lower case 31 to which a lower part 29 in the electricity accumulating section 27 is inserted; at least one elastic section 49, to which an upper part 43 of the electricity accumulating section 27 is inserted, where an upper end 21 of each first electricity accumulating element 11 and each second electricity accumulating element 17 come into contact; an upper case 41, where a plurality of ribs with which an upper peripheral section 19 of each first electricity accumulating element 11 and each second electricity accumulating element 17 come into contact; and an upper bus bar 55 that has a bent section 59 and connects upper electrodes 13 in the electricity accumulating section 27. The displacement width of the elastic section 49 is made larger than the height error of the first and second electricity accumulating elements 11, 17. The height of the rib is set so that the upper end peripheral section 19 of the lowest first electricity accumulating element 11 or the lowest second electricity accumulating element 17 within the range of the height error can abutted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は主に車両の補助電源等として利用される蓄電ユニットに関するものである。   The present invention relates to a power storage unit mainly used as an auxiliary power source for a vehicle.

近年、地球環境保護の観点からハイブリッドシステムやアイドリングストップシステムを搭載した自動車（以下、車両という）の開発が急速に進められており、それに伴い車両の制動エネルギーを電気エネルギーとして回生するシステムや、急加速時等でハイブリッド車のモータ駆動を補助するシステムについて各種の提案がなされてきている。   In recent years, automobiles (hereinafter referred to as vehicles) equipped with a hybrid system and an idling stop system have been rapidly developed from the viewpoint of protecting the global environment. Along with this, systems that regenerate braking energy of vehicles as electrical energy, Various proposals have been made on a system for assisting the motor drive of a hybrid vehicle during acceleration or the like.

このようなシステムにおいては、回生の場合は急変する制動エネルギーをできるだけ電気エネルギーとして蓄電素子に蓄える必要があり、モータ駆動補助の場合は車両を急加速できるだけの大電流を供給する必要があるので、いずれも蓄電素子としてバッテリよりも急速充放電特性に優れるキャパシタを用いたシステムが特に注目されている。   In such a system, in the case of regeneration, it is necessary to store braking energy that changes abruptly as much as possible in the energy storage element as electric energy, and in the case of motor drive assistance, it is necessary to supply a large current that can rapidly accelerate the vehicle. In any case, a system using a capacitor, which is superior in quick charge / discharge characteristics as compared with a battery, is attracting particular attention as a storage element.

しかし、車両を急加速できるほどの電力を蓄えるためには大容量の例えば電気二重層キャパシタが必要となり、さらにこのキャパシタの充電電圧は２．２Ｖ程度で低いので、多数のキャパシタを接続して電圧を上げる必要がある。   However, in order to store electric power that can accelerate the vehicle rapidly, an electric double layer capacitor having a large capacity, for example, is required. Further, since the charging voltage of this capacitor is as low as about 2.2V, a large number of capacitors are connected to the voltage. It is necessary to raise.

このように多数の蓄電素子を保持し接続した構成例が特許文献１に記載されている。これは蓄電素子に円筒型電池を用いた蓄電ユニットの例であるが、図７に示すように円筒型電池１（透視図で示す）は、その両端を上下の支持体２の電池穴２ａに挿入することにより保持されている。この際、電池穴２ａには図７の下側の支持体２に示すように段差が設けてあるので、この段差に円筒型電池１の両端周囲部が当接することにより固定できる。支持体２には電極孔２ｂが設けられており、電極孔２ｂを通して円筒型電池１の両端に設けた電極が露出する構成となっている。露出した電極は図示しない接続板（バスバー）で接続される。接続板は溝２ｃに収納される。このような構成とすることにより、多数の蓄電素子を同時に保持できる蓄電ユニットが得られる。
特許第３７７７７４８号公報 A configuration example in which a large number of power storage elements are held and connected as described above is described in Patent Document 1. This is an example of a power storage unit using a cylindrical battery as a power storage element. As shown in FIG. 7, the cylindrical battery 1 (shown in a perspective view) is connected to the battery holes 2a of the upper and lower supports 2 at both ends. It is held by inserting. At this time, since a step is provided in the battery hole 2a as shown in the lower support 2 in FIG. 7, the battery hole 2a can be fixed by contacting the peripheral portions of both ends of the cylindrical battery 1 with this step. The support 2 is provided with electrode holes 2b, and the electrodes provided at both ends of the cylindrical battery 1 are exposed through the electrode holes 2b. The exposed electrodes are connected by a connection plate (bus bar) (not shown). The connection plate is accommodated in the groove 2c. With such a configuration, a power storage unit capable of simultaneously holding a large number of power storage elements can be obtained.
Japanese Patent No. 3777748

このような蓄電ユニットは確かに多数の蓄電素子を保持することが可能となるのであるが、このような蓄電ユニットを車両に搭載すると、次のような問題があった。   Such a power storage unit can certainly hold a large number of power storage elements. However, when such a power storage unit is mounted on a vehicle, there are the following problems.

蓄電素子である円筒型電池１は例えば有底円筒の中に電池材料を投入後、上部を電極フタで封止する構造を有する。この場合、有底円筒は一般にプレスによる深絞り成型で製造されるので、円筒直径の誤差は小さい。一方、電極フタで封止を行う際は、２つの部材（有底円筒と電極フタ）を重ねて同時にかしめることになるため、それぞれの部材の寸法誤差に加え、かしめ工程による誤差が加わるので、円筒直径の誤差に比べ円筒型電池１の高さ誤差は大きくなる。   The cylindrical battery 1 that is a power storage element has a structure in which, for example, a battery material is put into a bottomed cylinder and the upper part is sealed with an electrode lid. In this case, since the bottomed cylinder is generally manufactured by deep drawing using a press, the error of the cylinder diameter is small. On the other hand, when sealing with an electrode lid, two members (bottomed cylinder and electrode lid) are overlapped and caulked at the same time, so in addition to the dimensional error of each member, an error due to the caulking process is added. The height error of the cylindrical battery 1 becomes larger than the error of the cylindrical diameter.

このような高さ方向の誤差が大きい複数の円筒型電池１を図７に示す支持体２に挿入保持すると、電池穴２ａの段差は固定されているので、組み立てた時に上下の支持体２の間隔は最も高い円筒型電池１により決定される。ゆえに、他の円筒型電池１は電池穴２ａの段差に確実に当接することができず、高さ誤差に応じた隙間が生じた状態で保持されることになる。この状態で円筒型電池１は接続板で接続されるので、高さの低い円筒型電池１は上下の接続板によりいわゆる宙吊り状態で保持されていることになる。   When a plurality of cylindrical batteries 1 having large errors in the height direction are inserted and held in the support 2 shown in FIG. 7, the step of the battery hole 2a is fixed. The interval is determined by the highest cylindrical battery 1. Therefore, the other cylindrical battery 1 cannot be reliably brought into contact with the step of the battery hole 2a, and is held in a state where a gap corresponding to the height error is generated. In this state, the cylindrical battery 1 is connected by the connection plate, so the cylindrical battery 1 having a low height is held in a so-called suspended state by the upper and lower connection plates.

この蓄電ユニットに車両の振動が加わると、高さの低い円筒型電池１は電池穴２ａの段差との間に隙間があるので、円筒型電池１が隙間の範囲で高さ方向に振動することになる。この振動応力は電極と接続板の接続部分や接続板自体に印加されるので、接続部分の接触抵抗が大きくなって発熱したり、接続板が徐々に変動応力疲労を起こす可能性があり、その結果、信頼性が低下するという課題があった。   When a vehicle vibration is applied to the power storage unit, the cylindrical battery 1 having a low height has a gap between the step of the battery hole 2a, and thus the cylindrical battery 1 vibrates in the height direction within the gap. become. Since this vibration stress is applied to the connection part of the electrode and the connection plate and the connection plate itself, there is a possibility that the contact resistance of the connection part will increase and heat will be generated, and the connection plate may gradually cause fluctuating stress fatigue. As a result, there existed a subject that reliability fell.

本発明は、前記従来の課題を解決するもので、高さ誤差のある蓄電素子を確実に保持できる高信頼蓄電ユニットを提供することを目的とする。   An object of the present invention is to solve the conventional problems described above, and to provide a highly reliable power storage unit that can reliably hold a power storage element having a height error.

前記従来の課題を解決するために、本発明の蓄電ユニットは、柱形状を有し、前記柱形状の両端に設けた上部電極と下部電極がそれぞれ正極と負極である第１蓄電素子と、前記上部電極と下部電極がそれぞれ負極と正極である第２蓄電素子と、前記第１蓄電素子と前記第２蓄電素子における前記上部電極同士、または前記下部電極同士を接続する平坦な板状金属の下部バスバーとからなる蓄電部と、複数の前記蓄電部の下部が挿入される下ケースと、複数の前記蓄電部の上部が挿入されるとともに、前記各第１蓄電素子、および各第２蓄電素子の上端部の一部が当接する少なくとも１つの弾性部と、前記各第１蓄電素子、および各第２蓄電素子の上端周囲部の一部が当接する三角錐状の複数のリブを設けた上ケースと、屈曲部を有し、複数の前記蓄電部の前記上部電極間を接続する上部バスバーとから構成され、前記弾性部の変位幅は複数の前記第１蓄電素子、および第２蓄電素子の高さ誤差より大きくするとともに、前記リブは前記高さ誤差の範囲内で最も高さが低い前記第１蓄電素子、または第２蓄電素子の前記上端周囲部の一部が当接できる高さとしたものである。   In order to solve the conventional problem, the power storage unit of the present invention has a first power storage element having a column shape, and an upper electrode and a lower electrode provided at both ends of the column shape are a positive electrode and a negative electrode, respectively, A second electricity storage element in which an upper electrode and a lower electrode are respectively a negative electrode and a positive electrode; a lower part of a flat plate metal that connects the upper electrodes or the lower electrodes in the first electricity storage element and the second electricity storage element; A power storage unit including a bus bar, a lower case into which lower portions of the plurality of power storage units are inserted, and upper portions of the plurality of power storage units are inserted, and each of the first power storage elements and each of the second power storage elements An upper case provided with at least one elastic part with which a part of the upper end part abuts, and a plurality of triangular pyramid-shaped ribs with which a part of the peripheral part of the upper end of each of the first power storage elements and each of the second power storage elements abuts And having a bent portion and a plurality of The upper bus bar connecting the upper electrodes of the power storage unit, the displacement width of the elastic portion is larger than the height error of the plurality of first power storage elements and second power storage elements, and the rib is The first power storage element having the lowest height within the range of the height error or a height at which a part of the periphery of the upper end of the second power storage element can be brought into contact.

本発明によれば、第１蓄電素子、および第２蓄電素子を上ケースに挿入することで、上ケースに設けたリブが上端周囲部に押し潰されつつ弾性部が上端部の一部に当接するので、組み立てた時に弾性部が第１蓄電素子と第２蓄電素子の高さ誤差を吸収しながら下部方向に応力を印加するとともに、リブにより強固に固定される。その結果、高さ誤差があっても全ての第１蓄電素子と第２蓄電素子を保持固定できるので、振動による電極とバスバーの接続部分やバスバー自身への影響を低減でき、高信頼性が得られる。   According to the present invention, by inserting the first power storage element and the second power storage element into the upper case, the rib provided on the upper case is crushed by the periphery of the upper end, and the elastic portion hits a part of the upper end. Therefore, when assembled, the elastic portion applies stress in the lower direction while absorbing the height error between the first power storage element and the second power storage element, and is firmly fixed by the rib. As a result, even if there is a height error, all the first power storage elements and the second power storage elements can be held and fixed, so that the influence of the vibration on the connection portion between the electrode and the bus bar and the bus bar itself can be reduced, and high reliability can be obtained. It is done.

以下、本発明を実施するための最良の形態について図面を参照しながら説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

（実施の形態）
図１は本発明の実施の形態における蓄電ユニットの蓄電部における分解斜視図である。図２は本発明の実施の形態における蓄電ユニットの一部分解斜視図である。図３は本発明の実施の形態における蓄電ユニットの上ケースを底部から見た時の平面図である。図４は本発明の実施の形態における蓄電ユニットの上ケースを取り付ける時の一部断面図である。図５は本発明の実施の形態における蓄電ユニットの一部断面図である。図６は本発明の実施の形態における蓄電ユニットの一部組立斜視図である。なお、本実施の形態では車両用の蓄電ユニットの構成例について説明する。 (Embodiment)
FIG. 1 is an exploded perspective view of a power storage unit of a power storage unit according to an embodiment of the present invention. FIG. 2 is a partially exploded perspective view of the power storage unit in the embodiment of the present invention. FIG. 3 is a plan view of the upper case of the power storage unit in the embodiment of the present invention as viewed from the bottom. FIG. 4 is a partial cross-sectional view when attaching the upper case of the power storage unit in the embodiment of the present invention. FIG. 5 is a partial cross-sectional view of the power storage unit in the embodiment of the present invention. FIG. 6 is a partially assembled perspective view of the power storage unit according to the embodiment of the present invention. Note that in this embodiment, a configuration example of a power storage unit for a vehicle will be described.

図１において、電力を蓄える円柱形状の蓄電素子は２種類からなる。まず、第１蓄電素子１１は円柱形状の両端に設けた上部電極１３と下部電極１５がそれぞれ正極と負極になるように内部で接続されている。一方、第２蓄電素子１７は上部電極１３と下部電極１５がそれぞれ負極と正極になるように内部で接続されている。第１蓄電素子１１と第２蓄電素子１７はいずれも例えば直径３ｃｍの電気二重層キャパシタである。第１蓄電素子１１と第２蓄電素子１７の製法は従来の円筒型電池と同様である。従って、第１蓄電素子１１と第２蓄電素子１７の一方の端面（図１では上面）には、いずれもかしめ工程により盛り上がった上端周囲部１９が形成される。なお、第１蓄電素子１１と第２蓄電素子１７の有底円筒部、および上端部２１はアルミニウム製であり、特に上端部２１はプレス成型することにより、上端周囲部１９よりも高さが高い半円状の上部電極１３が形成されている。また、有底円筒部と上端部２１の間には絶縁部材（図示せず）が配されるようにしてかしめている。なお、図１に示すように上端部２１には上部電極１３以外で中心部分を除く位置に調圧弁２３が設けてある。調圧弁２３は第１蓄電素子１１や第２蓄電素子１７の内部に充填された電解液が気化した際に、それを逃がすためのものである。これにより、第１蓄電素子１１と第２蓄電素子１７の内圧上昇を防ぐことができる。   In FIG. 1, there are two types of cylindrical storage elements for storing electric power. First, the 1st electrical storage element 11 is internally connected so that the upper electrode 13 and the lower electrode 15 which were provided in the column-shaped both ends may become a positive electrode and a negative electrode, respectively. On the other hand, the second power storage element 17 is internally connected so that the upper electrode 13 and the lower electrode 15 become a negative electrode and a positive electrode, respectively. The first power storage element 11 and the second power storage element 17 are both electric double layer capacitors having a diameter of 3 cm, for example. The manufacturing method of the 1st electrical storage element 11 and the 2nd electrical storage element 17 is the same as that of the conventional cylindrical battery. Therefore, an upper end peripheral portion 19 that is raised by the caulking process is formed on one end face (the upper face in FIG. 1) of the first storage element 11 and the second storage element 17. In addition, the bottomed cylindrical part of the 1st electrical storage element 11 and the 2nd electrical storage element 17, and the upper end part 21 are the products made from aluminum, and especially the upper end part 21 is higher than the upper periphery part 19 by press molding. A semicircular upper electrode 13 is formed. Further, an insulating member (not shown) is caulked between the bottomed cylindrical portion and the upper end portion 21. As shown in FIG. 1, a pressure regulating valve 23 is provided at the upper end portion 21 at a position other than the upper electrode 13 except for the central portion. The pressure regulating valve 23 is used to release the electrolyte filled in the first power storage element 11 and the second power storage element 17 when the electrolyte is vaporized. Thereby, the internal pressure rise of the 1st electrical storage element 11 and the 2nd electrical storage element 17 can be prevented.

ここで、第１蓄電素子１１と第２蓄電素子１７において、上部電極１３に対する調圧弁２３の位置が互いに異なるように形成している。具体的には、図１において上部電極１３が手前になるように見た時、第１蓄電素子１１の調圧弁２３は上部電極１３の左上に配置されるが、第２蓄電素子１７の調圧弁２３は上部電極１３の右上に配置される。このように形成することで、正極と負極の内部接続が異なる第１蓄電素子１１と第２蓄電素子１７の区別を行っている。さらに、完成した蓄電ユニットを水平方向に寝かせて配置する場合、全ての調圧弁２３が上側になるように配置することができるので、電解液の調圧弁２３への充満を回避することが可能となる。   Here, in the 1st electrical storage element 11 and the 2nd electrical storage element 17, it forms so that the position of the pressure regulation valve 23 with respect to the upper electrode 13 may mutually differ. Specifically, when viewed so that the upper electrode 13 is in front in FIG. 1, the pressure regulating valve 23 of the first power storage element 11 is disposed on the upper left of the upper electrode 13, but the pressure regulating valve of the second power storage element 17. 23 is arranged at the upper right of the upper electrode 13. By forming in this way, the first power storage element 11 and the second power storage element 17 having different internal connections between the positive electrode and the negative electrode are distinguished. Further, when the completed power storage unit is laid down in the horizontal direction, all the pressure regulating valves 23 can be disposed on the upper side, so that it is possible to avoid filling the pressure regulating valves 23 with the electrolyte. Become.

第１蓄電素子１１と第２蓄電素子１７の各下部電極１５同士は、平坦な楕円板状金属の下部バスバー２５により、電気的、機械的に接続される。この際、後述する上部バスバーの接続距離を短くして内部抵抗を下げるために、上部電極１３が第１蓄電素子１１と第２蓄電素子１７において互いに最も遠くなる方向に下部バスバー２５を接続している。なお、下部バスバー２５は板厚０．５ｍｍのアルミニウム製としたので、下部電極１５と同じ金属製となる。このように同一金属とすることで両者を良好にレーザ溶接することができる。その結果、確実な接続が得られるとともに、湿気で局部電池を形成することがなくなり防食性も向上する。なお、同一金属であれば他の金属でも構わないが、電気二重層キャパシタの内部電極がアルミニウム製であるため、内部電極を上部電極１３や下部電極１５に溶接接合する上で、これらもアルミニウム製としている。従って、下部バスバー２５もアルミニウム製とした。   The lower electrodes 15 of the first power storage element 11 and the second power storage element 17 are electrically and mechanically connected to each other by a flat ellipsoidal metal lower bus bar 25. At this time, in order to reduce the internal resistance by shortening the connection distance of the upper bus bar, which will be described later, the upper electrode 13 is connected to the lower bus bar 25 in the direction farthest from each other in the first power storage element 11 and the second power storage element 17. Yes. Since the lower bus bar 25 is made of aluminum having a thickness of 0.5 mm, it is made of the same metal as the lower electrode 15. Thus, by using the same metal, both can be favorably laser welded. As a result, a reliable connection can be obtained, and the local battery is not formed by moisture, and the corrosion resistance is improved. Other metals may be used as long as they are the same metal, but since the internal electrode of the electric double layer capacitor is made of aluminum, when the internal electrode is welded to the upper electrode 13 or the lower electrode 15, they are also made of aluminum. It is said. Therefore, the lower bus bar 25 is also made of aluminum.

なお、図１の構成では上端部２１に調圧弁２３が設けられているので、第１蓄電素子１１や第２蓄電素子１７を図１の上下逆さまに配置すると、調圧弁２３に電解液が充満し、気化した電解液を逃がすことができなくなる。そのため、調圧弁２３が上方に配置されるような構成としているが、調圧弁２３が不要な蓄電素子構成であれば、下部バスバー２５で第１蓄電素子１１と第２蓄電素子１７における上部電極１３同士を接続する構成としてもよい。この場合、上部電極１３は下方向に向くことになる。   In the configuration of FIG. 1, the pressure regulating valve 23 is provided at the upper end 21. Therefore, when the first power storage element 11 and the second power storage element 17 are arranged upside down in FIG. 1, the pressure regulating valve 23 is filled with the electrolyte. As a result, the evaporated electrolyte cannot be released. For this reason, the pressure regulating valve 23 is arranged at the upper side. However, if the pressure regulating valve 23 is not required, the upper electrode 13 in the first power storage element 11 and the second power storage element 17 is formed by the lower bus bar 25. It is good also as a structure which connects each other. In this case, the upper electrode 13 is directed downward.

このような構成により、第１蓄電素子１１と第２蓄電素子１７は下部バスバー２５により直列接続されることになる。以下、下部バスバー２５で接続された１組の第１蓄電素子１１と第２蓄電素子１７を蓄電部２７と呼ぶ。   With such a configuration, the first power storage element 11 and the second power storage element 17 are connected in series by the lower bus bar 25. Hereinafter, the set of the first power storage element 11 and the second power storage element 17 connected by the lower bus bar 25 is referred to as a power storage unit 27.

次に、蓄電ユニットの全体構成を図２により説明する。   Next, the overall configuration of the power storage unit will be described with reference to FIG.

複数（ここでは３組とした）の蓄電部２７の下部２９は樹脂製の下ケース３１に一体形成された下部保持穴３３に挿入される。この際、蓄電部２７をスムースに収納できるように下部保持穴３３の大きさは蓄電部２７の底面寸法より例えば０．１〜０．２ｍｍ程度大きくしている。なお、下部バスバー２５は平坦であり、第１蓄電素子１１と第２蓄電素子１７に密着するように接続されており、かつ下部保持穴３３の底面は図２に示すように平坦に形成されているので、蓄電部２７を下部保持穴３３に挿入すると、蓄電部２７の高さ方向の基準面は下部保持穴３３の底面となる。   Lower portions 29 of a plurality (three sets here) of power storage units 27 are inserted into lower holding holes 33 formed integrally with a lower case 31 made of resin. At this time, the size of the lower holding hole 33 is set to be, for example, about 0.1 to 0.2 mm larger than the bottom surface dimension of the power storage unit 27 so that the power storage unit 27 can be smoothly stored. The lower bus bar 25 is flat and is connected so as to be in close contact with the first power storage element 11 and the second power storage element 17, and the bottom surface of the lower holding hole 33 is formed flat as shown in FIG. Therefore, when the power storage unit 27 is inserted into the lower holding hole 33, the reference surface in the height direction of the power storage unit 27 becomes the bottom surface of the lower holding hole 33.

また、下ケース３１には複数（図２では５ヶ所）の固定ネジ穴３５が設けられている。固定ネジ穴３５には固定棒３７が取り付けられる。具体的には、固定棒３７の両端にはメネジが形成されているので、固定ネジ穴３５を介して固定ネジ３９を締め込むことにより接続固定している。この際、固定ネジ３９の頭部が下ケース３１から突出しないように、例えば固定ネジ３９を皿ネジにしている。これにより、下ケース３１と後述する上ケースを強固に固定できる。   The lower case 31 is provided with a plurality (five places in FIG. 2) of fixing screw holes 35. A fixing rod 37 is attached to the fixing screw hole 35. Specifically, since female screws are formed at both ends of the fixing rod 37, the fixing screws 39 are tightened through the fixing screw holes 35 to be connected and fixed. At this time, for example, the fixing screw 39 is a countersunk screw so that the head of the fixing screw 39 does not protrude from the lower case 31. Thereby, the lower case 31 and the upper case described later can be firmly fixed.

次に、上ケース４１について説明する。上ケース４１は下ケース３１と同様に樹脂製であり、蓄電部２７を固定するものであるが、その際に第１蓄電素子１１と第２蓄電素子１７の高さ誤差を吸収する機能も併せ持つ。まず、蓄電部２７の上部４３を固定するために、上部保持穴４５（図２に円筒状点線で示す）が設けられている。上部保持穴４５は下部保持穴３３と形状が異なり、第１蓄電素子１１や第２蓄電素子１７の直径より０．１〜０．２ｍｍ大きい直径を有する独立した円筒状としている。ここに第１蓄電素子１１や第２蓄電素子１７の上部４３が挿入される。これにより、上部電極１３が上ケース４１に設けた開口部４７から突出するので、後述する上部バスバーが接続しやすくなる。   Next, the upper case 41 will be described. The upper case 41 is made of resin like the lower case 31 and fixes the power storage unit 27. At that time, the upper case 41 also has a function of absorbing a height error between the first power storage element 11 and the second power storage element 17. . First, an upper holding hole 45 (shown by a cylindrical dotted line in FIG. 2) is provided to fix the upper portion 43 of the power storage unit 27. The upper holding hole 45 is different in shape from the lower holding hole 33 and has an independent cylindrical shape having a diameter larger by 0.1 to 0.2 mm than the diameter of the first power storage element 11 or the second power storage element 17. The upper part 43 of the 1st electrical storage element 11 or the 2nd electrical storage element 17 is inserted here. Thereby, since the upper electrode 13 protrudes from the opening part 47 provided in the upper case 41, it becomes easy to connect the upper bus bar mentioned later.

また、上ケース４１には片持ち梁状の弾性部４９が一体形成されている。これは、各第１蓄電素子１１、および各第２蓄電素子１７の上端部２１の一部が当接することで第１蓄電素子１１と第２蓄電素子１７の高さ誤差を吸収する。この詳細は後述する。なお、本実施の形態では、各第１蓄電素子１１、および各第２蓄電素子１７に対し弾性部４９をそれぞれ１ヶ所づつ設けている。   The upper case 41 is integrally formed with a cantilevered elastic portion 49. This absorbs a height error between the first power storage element 11 and the second power storage element 17 by abutment of each first power storage element 11 and a part of the upper end portion 21 of each second power storage element 17. Details of this will be described later. In the present embodiment, one elastic portion 49 is provided for each first power storage element 11 and each second power storage element 17.

ここで、上ケース４１を図２の底面側から見た時の平面図を図３に示す。上ケース４１には独立した上部保持穴４５が６個形成されている。各上部保持穴４５には前記した開口部４７、および弾性部４９に加え、各上部保持穴４５の突き当たりの円周部分にリブ５１が一体形成されている。リブ５１は三角錐状であり、複数ヶ所（ここでは４ヶ所）形成されている。従って、第１蓄電素子１１や第２蓄電素子１７の上部４３を上部保持穴４５に挿入すると、上端部２１の一部が弾性部４９に当接するとともに、上端周囲部１９の一部がリブ５１にも当接する。この時の詳細を図４、５を用いて説明する。なお、これらの図では第１蓄電素子１１と第２蓄電素子１７の高さ誤差範囲において最も高いもの（図４、５の左側の第１蓄電素子１１）と最も低いもの（図４、５の右側の第２蓄電素子１７）を示した。   Here, FIG. 3 shows a plan view when the upper case 41 is viewed from the bottom side of FIG. Six independent upper holding holes 45 are formed in the upper case 41. In each upper holding hole 45, in addition to the opening 47 and the elastic portion 49 described above, a rib 51 is integrally formed at a circumferential portion at the end of each upper holding hole 45. The rib 51 has a triangular pyramid shape and is formed at a plurality of locations (here, 4 locations). Therefore, when the upper part 43 of the first power storage element 11 or the second power storage element 17 is inserted into the upper holding hole 45, a part of the upper end part 21 comes into contact with the elastic part 49 and a part of the upper end peripheral part 19 is a rib 51. Also abut. Details at this time will be described with reference to FIGS. In these figures, the highest one in the height error range of the first power storage element 11 and the second power storage element 17 (the first power storage element 11 on the left side in FIGS. 4 and 5) and the lowest one in FIGS. The right second power storage element 17) is shown.

まず、図４は第１蓄電素子１１や第２蓄電素子１７の上部４３を上部保持穴４５に挿入する前の一部断面図である。ここで、図４は図２の四角形状点線、および図３の点線における断面図を示す。   First, FIG. 4 is a partial cross-sectional view before the upper portion 43 of the first power storage element 11 or the second power storage element 17 is inserted into the upper holding hole 45. Here, FIG. 4 shows a sectional view taken along the dotted line in FIG. 2 and the dotted line in FIG.

前記したように、蓄電部２７の高さ方向の基準面は下部保持穴３３の底面であるので、第１蓄電素子１１、および第２蓄電素子１７の高さ誤差は図４に示すように上部４３に現れる。従って、高さ誤差は上ケース４１により吸収する必要がある。具体的には次のようにして吸収する構成としている。   As described above, since the reference plane in the height direction of the power storage unit 27 is the bottom surface of the lower holding hole 33, the height error of the first power storage element 11 and the second power storage element 17 is as shown in FIG. Appears at 43. Therefore, the height error needs to be absorbed by the upper case 41. Specifically, the absorption is performed as follows.

上部４３を上部保持穴４５に挿入すると、図４の矢印で示すように、まず弾性部４９に一体形成した弾性部先端５３が上端部２１に当接する。なお、弾性部先端５３は弾性部４９から突出するように設けられているので、弾性部４９は上端部２１の中心部分において上部電極１３を避け、かつできるだけ中心に近い部分に集中して当接する。その結果、第１蓄電素子１１や第２蓄電素子１７は下端の基準面に対してほぼ垂直方向に弾性応力を受けることができる。その後、上端周囲部１９は４ヶ所のリブ５１に当接する。この時の状態を図５に示す。   When the upper portion 43 is inserted into the upper holding hole 45, first, the elastic portion tip 53 integrally formed with the elastic portion 49 comes into contact with the upper end portion 21 as indicated by the arrow in FIG. Since the elastic portion tip 53 is provided so as to protrude from the elastic portion 49, the elastic portion 49 avoids the upper electrode 13 at the center portion of the upper end portion 21, and concentrates and contacts the portion as close to the center as possible. . As a result, the first power storage element 11 and the second power storage element 17 can receive elastic stress in a direction substantially perpendicular to the reference plane at the lower end. Thereafter, the upper peripheral portion 19 comes into contact with the four ribs 51. The state at this time is shown in FIG.

図５は上部４３を上部保持穴４５に挿入した後の一部断面図である。弾性部先端５３は上端部２１に当接することにより反りを発生する。その結果、第１蓄電素子１１や第２蓄電素子１７の高さ誤差を吸収しつつ、図５の下方に応力を与え、蓄電部２７を固定することができる。この時、図５に示すように最も高さの高い第１蓄電素子１１と最も高さの低い第２蓄電素子１７では弾性部４９の反り方（変位幅）が異なる。この違いが高さ誤差を吸収している。なお、図５に示した最大変位幅が、最大の高さ誤差を有する蓄電素子（ここでは第１蓄電素子１１）を上部保持穴４５に挿入した時に弾性部４９の変位し得る最大の幅であるので、これ以上変位することはない。従って、弾性部４９の変位幅は複数の第１蓄電素子１１、および第２蓄電素子１７の高さ誤差より大きく変位できるように構成してあるので、全ての高さ誤差を吸収することができる。   FIG. 5 is a partial cross-sectional view after the upper portion 43 is inserted into the upper holding hole 45. The elastic portion tip 53 is warped by contacting the upper end portion 21. As a result, it is possible to fix the power storage unit 27 by applying stress downward in FIG. 5 while absorbing the height error of the first power storage element 11 and the second power storage element 17. At this time, as shown in FIG. 5, the first power storage element 11 having the highest height and the second power storage element 17 having the lowest height have different warpage (displacement width) of the elastic portion 49. This difference absorbs the height error. 5 is the maximum width at which the elastic portion 49 can be displaced when the power storage element having the maximum height error (here, the first power storage element 11) is inserted into the upper holding hole 45. There is no further displacement. Therefore, since the displacement width of the elastic part 49 can be displaced more than the height errors of the plurality of first power storage elements 11 and the second power storage elements 17, all height errors can be absorbed. .

さらに、上端周囲部１９はリブ５１と当接するが、リブ５１は三角錐状に形成されているので、第１蓄電素子１１や第２蓄電素子１７が上部保持穴４５に押し込まれるとともに、リブ５１の当接部分から押し潰されていく。その結果、弾性部４９だけでなくリブ５１も第１蓄電素子１１や第２蓄電素子１７に対して図５の下方に応力を与える。これらの応力により、蓄電部２７はさらに強固に保持されることになる。この時、最も高さの低い右側の第２蓄電素子１７が上部保持穴４５に挿入されても、リブ５１の先端は僅かに潰される高さとなるように構成している。すなわち、リブ５１は高さ誤差の範囲内で最も高さが低い第２蓄電素子１７の上端周囲部１９の一部が当接できる高さとしている。これにより、最も高さが低い第２蓄電素子１７でも確実にリブ５１に当接できるので、全ての蓄電部２７を十分に保持することができ、車両の振動に対する高信頼性が得られる。   Further, the upper end peripheral portion 19 abuts on the rib 51, but the rib 51 is formed in a triangular pyramid shape, so that the first power storage element 11 and the second power storage element 17 are pushed into the upper holding hole 45 and the rib 51 It is crushed from the contact part. As a result, not only the elastic portion 49 but also the rib 51 applies stress to the first power storage element 11 and the second power storage element 17 in the lower part of FIG. Due to these stresses, the power storage unit 27 is held more firmly. At this time, even when the right second power storage element 17 having the lowest height is inserted into the upper holding hole 45, the tip of the rib 51 is configured to be slightly crushed. That is, the rib 51 has a height at which a part of the upper peripheral portion 19 of the second power storage element 17 having the lowest height within the range of the height error can abut. As a result, even the second power storage element 17 having the lowest height can reliably contact the rib 51, so that all the power storage units 27 can be sufficiently retained, and high reliability with respect to vehicle vibration can be obtained.

なお、弾性部４９やリブ５１の大きさ、位置、数量等は保持する蓄電素子の大きさや重さ、さらに振動条件等により適宜変更すればよい。さらに、弾性部４９は弾性部先端５３が上端部２１の中心近傍に位置することを条件として斜め方向に形成してもよい。また、弾性部４９やリブ５１は、これらの寸法精度を確保し、第１蓄電素子１１や第２蓄電素子１７と確実に当接させるために、上ケース４１と一体成型して形成する構成が望ましい。また、図５では上部バスバー５５が上部電極１３に接続されているが、この詳細は後述する。   Note that the size, position, quantity, and the like of the elastic portion 49 and the ribs 51 may be appropriately changed depending on the size and weight of the storage element to be held, vibration conditions, and the like. Furthermore, the elastic part 49 may be formed in an oblique direction on condition that the elastic part tip 53 is located in the vicinity of the center of the upper end part 21. In addition, the elastic portion 49 and the rib 51 are formed integrally with the upper case 41 in order to ensure the dimensional accuracy and to make sure that the elastic portion 49 and the rib 51 are in contact with the first power storage element 11 and the second power storage element 17. desirable. In FIG. 5, the upper bus bar 55 is connected to the upper electrode 13, and details thereof will be described later.

ここで、図２に戻って上ケース４１には下ケース３１と同様に固定棒３７を固定する固定ネジ穴３５が設けられている。ここに固定ネジ３９を締め込むことで上ケース４１と下ケース３１が最終的に強固に固定される。また、この組み立てにより、弾性部４９の変位幅やリブ５１の潰れ量が決定され、高さ誤差を吸収しつつ蓄電部２７を十分に保持固定することが可能となる。   Here, returning to FIG. 2, the upper case 41 is provided with a fixing screw hole 35 for fixing the fixing rod 37 similarly to the lower case 31. By tightening the fixing screw 39 here, the upper case 41 and the lower case 31 are finally firmly fixed. Further, by this assembly, the displacement width of the elastic portion 49 and the crushing amount of the rib 51 are determined, and the power storage portion 27 can be sufficiently held and fixed while absorbing the height error.

また、図２において上ケース４１の左端部にはインサートナット５７が埋め込まれている。同様に、図示していないが、上ケース４１の右端部にもインサートナットが埋め込まれている。   In FIG. 2, an insert nut 57 is embedded in the left end portion of the upper case 41. Similarly, although not shown, an insert nut is also embedded in the right end portion of the upper case 41.

次に、上部バスバー５５の構成について説明する。上部バスバー５５は隣り合う蓄電部２７の上部電極１３同士を接続する。本実施の形態における蓄電ユニットでは２個の上部バスバー５５を使用した。ここで、上部バスバー５５は上部電極１３とレーザ溶接接合するために、上部電極１３と同じ金属（アルミニウム）製とした。板厚は下部バスバー２５と同様に０．５ｍｍとした。また、上部バスバー５５の中央部分には屈曲部５９がプレス加工により一体形成されている。これにより、上部バスバー５５に印加される熱膨張や振動による応力を低減でき、上部電極１３との接続部分や上部バスバー５５自体の高信頼性を得ることができる。さらに、隣り合う蓄電部２７の高さが誤差範囲内で異なっていても、屈曲部５９で高さ誤差を吸収できるので、上部電極１３と上部バスバー５５が密着した状態でのレーザ溶接が可能となり、信頼性が高まる。   Next, the configuration of the upper bus bar 55 will be described. Upper bus bar 55 connects upper electrodes 13 of power storage units 27 adjacent to each other. In the power storage unit in the present embodiment, two upper bus bars 55 are used. Here, the upper bus bar 55 is made of the same metal (aluminum) as the upper electrode 13 in order to perform laser welding joining to the upper electrode 13. The plate thickness was set to 0.5 mm as with the lower bus bar 25. Further, a bent portion 59 is integrally formed at the center portion of the upper bus bar 55 by press working. Thereby, stress due to thermal expansion and vibration applied to the upper bus bar 55 can be reduced, and high reliability of the connection portion with the upper electrode 13 and the upper bus bar 55 itself can be obtained. Further, even if the heights of the adjacent power storage units 27 are different within the error range, the bent portion 59 can absorb the height error, so that laser welding can be performed with the upper electrode 13 and the upper bus bar 55 in close contact with each other. , Increase reliability.

また、上部バスバー５５、および下部バスバー２５で接続された複数の蓄電部２７の最端部における上部電極１３には、隣り合う蓄電部２７がないので、外部との配線を行うための外部接続上部バスバー６１が接続される。これは、図２において左端部と右端部の上部電極１３にそれぞれ接続される。外部接続上部バスバー６１は上部バスバー５５と同じく板厚０．５ｍｍのアルミニウム製で、屈曲部５９も形成されている。屈曲部５９の役割は上部バスバー５５と同じである。なお、外部接続上部バスバー６１は外部と電気的に接続するためにネジ穴６３が設けられている。ネジ穴６３は外部接続上部バスバー６１を上部電極１３に接続した際に、インサートナット５７と対向するように位置している。   Further, since the upper electrode 13 at the end of the plurality of power storage units 27 connected by the upper bus bar 55 and the lower bus bar 25 does not have the adjacent power storage unit 27, the upper part of the external connection for wiring with the outside A bus bar 61 is connected. This is connected to the upper electrode 13 at the left end and the right end in FIG. The external connection upper bus bar 61 is made of aluminum having a plate thickness of 0.5 mm, like the upper bus bar 55, and a bent portion 59 is also formed. The role of the bent portion 59 is the same as that of the upper bus bar 55. The external connection upper bus bar 61 is provided with a screw hole 63 for electrical connection with the outside. The screw hole 63 is positioned so as to face the insert nut 57 when the external connection upper bus bar 61 is connected to the upper electrode 13.

以上の各部材を組み立てた状態を図６に示す。なお、図６の四角形点線で示した部分の断面図が前記した図５に相当する。上部バスバー５５、または外部接続上部バスバー６１と、上部電極１３との間は、下部バスバー２５の下部電極１５への接続と同様にレーザにより溶接されている。レーザ溶接部位を図６の×印で示す。図６ではスポット状に多点を溶接しているが、これは溶接位置を順次ずらして線状に溶接接続してもよい。この場合はスポット状に比べ接続信頼性が向上する。なお、線状のレーザ溶接は下部バスバー２５と下部電極１５の接続に適用してもよい。   FIG. 6 shows the assembled state of the above members. Note that the cross-sectional view of the portion indicated by the dotted line in FIG. 6 corresponds to FIG. 5 described above. The upper bus bar 55 or the externally connected upper bus bar 61 and the upper electrode 13 are welded by laser similarly to the connection of the lower bus bar 25 to the lower electrode 15. The laser welding site is indicated by a cross in FIG. Although multiple points are welded in a spot shape in FIG. 6, this may be welded in a linear shape by sequentially shifting the welding position. In this case, the connection reliability is improved as compared with the spot shape. Note that linear laser welding may be applied to the connection between the lower bus bar 25 and the lower electrode 15.

外部接続上部バスバー６１には外部に接続するために外部バスバー７１が取り付けられる。具体的には、外部バスバー７１に設けた外部バスバー穴７３とネジ穴６３を介してインサートナット５７にネジ７５を締め込むことにより電気的に接続される。この際、ワッシャ７７を介してもよい。この場合はネジ７５の緩みを低減できる。なお、外部バスバー７１は板厚１ｍｍの銅製とした。これにより、外部バスバー７１の内部抵抗や、外部バスバー７１と外部接続上部バスバー６１の接触抵抗が下がるので、発熱による損失を低減することができる。なお、図示していないが図６の右端部の外部接続上部バスバー６１にも外部バスバーを同様に接続している。また、外部バスバー７１を用いて複数の蓄電ユニットを接続してもよい。この場合は、外部バスバー７１への熱膨張や振動による応力印加を低減するために外部バスバー屈曲部７９を設ける構成が望ましい。   An external bus bar 71 is attached to the external connection upper bus bar 61 for connection to the outside. Specifically, electrical connection is established by tightening a screw 75 into the insert nut 57 via an external bus bar hole 73 and a screw hole 63 provided in the external bus bar 71. At this time, a washer 77 may be provided. In this case, loosening of the screw 75 can be reduced. The external bus bar 71 was made of copper having a plate thickness of 1 mm. As a result, the internal resistance of the external bus bar 71 and the contact resistance between the external bus bar 71 and the external connection upper bus bar 61 are lowered, so that loss due to heat generation can be reduced. Although not shown, the external bus bar is similarly connected to the external connection upper bus bar 61 at the right end of FIG. A plurality of power storage units may be connected using the external bus bar 71. In this case, it is desirable that the external bus bar bent portion 79 is provided in order to reduce stress application due to thermal expansion or vibration to the external bus bar 71.

以上の構成、動作により、蓄電部２７の高さ誤差を弾性部４９が吸収し、かつ弾性部４９とリブ５１が下部方向に応力を印加して蓄電部２７を強固に保持固定するので、溶接接続部分の発熱、および上部バスバー５５や下部バスバー２５の変動応力疲労が低減され、高信頼性が得られる蓄電ユニットを実現できる。   With the above configuration and operation, the elastic portion 49 absorbs the height error of the power storage unit 27, and the elastic portion 49 and the rib 51 apply stress in the lower direction to firmly hold and fix the power storage unit 27. Heat generation at the connecting portion and fluctuating stress fatigue of the upper bus bar 55 and the lower bus bar 25 are reduced, and a power storage unit with high reliability can be realized.

なお、本実施の形態ではネジ７５をインサートナット５７で締め込む構成としたが、これはナットが当接する内幅を有するナット収納部を、上ケース４１の、ネジ穴６３と対向する位置に一体成型で設け、ナット収納部にナットを収納する構成としてもよい。この場合、ナットの角がナット収納部の内幅部分の壁面に当接するので、ナットが空回りすることなくネジ７５を締め込むことができる。   In the present embodiment, the screw 75 is tightened with the insert nut 57. However, in this embodiment, the nut housing portion having an inner width with which the nut abuts is integrated with the upper case 41 at a position facing the screw hole 63. It is good also as a structure which provides by molding and accommodates a nut in a nut accommodating part. In this case, since the corner of the nut abuts against the wall surface of the inner width portion of the nut storage portion, the screw 75 can be tightened without the nut idling.

また、本実施の形態では第１蓄電素子１１、および第２蓄電素子１７が円柱形状であるとして説明したが、これは角柱形状でもよい。さらに、第１蓄電素子１１と第２蓄電素子１７に電気二重層キャパシタを用いた構成を説明したが、これは電気化学キャパシタ等の他のキャパシタや二次電池等でもよい。   Further, in the present embodiment, the first power storage element 11 and the second power storage element 17 are described as being cylindrical, but this may be a prismatic shape. Furthermore, although the structure which used the electrical double layer capacitor for the 1st electrical storage element 11 and the 2nd electrical storage element 17 was demonstrated, this may be other capacitors, such as an electrochemical capacitor, a secondary battery, etc.

また、本実施の形態では蓄電ユニットを車両に適用した場合について述べたが、それに限らず、一般の非常用補助電源等にも適用可能である。   In the present embodiment, the case where the power storage unit is applied to a vehicle has been described. However, the present invention is not limited to this, and can be applied to a general emergency auxiliary power source or the like.

本発明にかかる蓄電ユニットは、蓄電素子の高さ誤差を弾性部が吸収する構成としたので、溶接接続部分の発熱やバスバーの変動応力疲労が低減でき高信頼性が得られ、特に振動を受ける車両用補助電源に利用される蓄電ユニット等として有用である。   The power storage unit according to the present invention has a configuration in which the elastic portion absorbs the height error of the power storage element, so that heat generation at the welded connection portion and fluctuating stress fatigue of the bus bar can be reduced, and high reliability is obtained. It is useful as a power storage unit used for an auxiliary power source for vehicles.

本発明の実施の形態における蓄電ユニットの蓄電部における分解斜視図The disassembled perspective view in the electrical storage part of the electrical storage unit in embodiment of this invention 本発明の実施の形態における蓄電ユニットの一部分解斜視図The partial exploded perspective view of the electrical storage unit in embodiment of this invention 本発明の実施の形態における蓄電ユニットの上ケースを底部から見た時の平面図The top view when the upper case of the electrical storage unit in embodiment of this invention is seen from the bottom part 本発明の実施の形態における蓄電ユニットの上ケースを取り付ける時の一部断面図Partial sectional view when attaching the upper case of the power storage unit in the embodiment of the present invention 本発明の実施の形態における蓄電ユニットの一部断面図The partial cross section figure of the electrical storage unit in embodiment of this invention 本発明の実施の形態における蓄電ユニットの一部組立斜視図The partial assembly perspective view of the electrical storage unit in embodiment of this invention 従来の蓄電ユニットの斜視図A perspective view of a conventional power storage unit

符号の説明Explanation of symbols

１１ 第１蓄電素子
１３ 上部電極
１５ 下部電極
１７ 第２蓄電素子
１９ 上端周囲部
２１ 上端部
２５ 下部バスバー
２７ 蓄電部
２９ 下部
３１ 下ケース
３５ 固定ネジ穴
３７ 固定棒
３９ 固定ネジ
４１ 上ケース
４３ 上部
４９ 弾性部
５１ リブ
５５ 上部バスバー
５９ 屈曲部 DESCRIPTION OF SYMBOLS 11 1st electrical storage element 13 Upper electrode 15 Lower electrode 17 2nd electrical storage element 19 Upper end circumference part 21 Upper end part 25 Lower bus bar 27 Electrical storage part 29 Lower part 31 Lower case 35 Fixing screw hole 37 Fixing rod 39 Fixing screw 41 Upper case 43 Upper part 49 Elastic part 51 Rib 55 Upper bus bar 59 Bent part

Claims (6)

柱形状を有し、前記柱形状の両端に設けた上部電極と下部電極がそれぞれ正極と負極である第１蓄電素子と、
前記上部電極と下部電極がそれぞれ負極と正極である第２蓄電素子と、
前記第１蓄電素子と前記第２蓄電素子における前記上部電極同士、または前記下部電極同士を接続する平坦な板状金属の下部バスバーとからなる蓄電部と、
複数の前記蓄電部の下部が挿入される下ケースと、
複数の前記蓄電部の上部が挿入されるとともに、前記各第１蓄電素子、および各第２蓄電素子の上端部の一部が当接する少なくとも１つの弾性部と、前記各第１蓄電素子、および各第２蓄電素子の上端周囲部の一部が当接する三角錐状の複数のリブを設けた上ケースと、
屈曲部を有し、複数の前記蓄電部の前記上部電極間を接続する上部バスバーとから構成され、
前記弾性部の変位幅は複数の前記第１蓄電素子、および第２蓄電素子の高さ誤差より大きくするとともに、
前記リブは前記高さ誤差の範囲内で最も高さが低い前記第１蓄電素子、または第２蓄電素子の前記上端周囲部の一部が当接できる高さとした蓄電ユニット。 A first power storage element having a column shape, wherein an upper electrode and a lower electrode provided at both ends of the column shape are a positive electrode and a negative electrode, respectively;
A second power storage element in which the upper electrode and the lower electrode are a negative electrode and a positive electrode, respectively;
A power storage unit composed of a flat plate-shaped metal lower bus bar connecting the upper electrodes of the first power storage element and the second power storage element or the lower electrodes;
A lower case into which lower portions of the plurality of power storage units are inserted;
At least one elastic part with which the upper part of each of the plurality of power storage units is inserted and a part of the upper end part of each first power storage element and each second power storage element abuts, each first power storage element, and An upper case provided with a plurality of triangular pyramid-shaped ribs with which a part of the periphery of the upper end of each second power storage element comes into contact;
An upper bus bar having a bent portion and connecting the upper electrodes of the plurality of power storage units;
While the displacement width of the elastic part is larger than the height error of the plurality of first power storage elements and second power storage elements,
The rib is a power storage unit having a height at which a part of the peripheral portion of the upper end of the first power storage element or the second power storage element having the lowest height within the range of the height error can contact. 前記弾性部、および前記リブは前記上ケースと一体形成した請求項１に記載の蓄電ユニット。 The power storage unit according to claim 1, wherein the elastic portion and the rib are integrally formed with the upper case. 前記弾性部は前記上端部の中心部分において前記上部電極を避けた部分に当接する請求項１に記載の蓄電ユニット。 The power storage unit according to claim 1, wherein the elastic portion is in contact with a portion where the upper electrode is avoided in a central portion of the upper end portion. 前記上部電極、下部電極、上部バスバー、および下部バスバーは同一の金属製である請求項１に記載の蓄電ユニット。 The power storage unit according to claim 1, wherein the upper electrode, the lower electrode, the upper bus bar, and the lower bus bar are made of the same metal. 前記上部電極と前記上部バスバー、および前記下部電極と前記下部バスバーは、それぞれレーザ溶接により線状に接続される請求項１に記載の蓄電ユニット。 2. The power storage unit according to claim 1, wherein the upper electrode and the upper bus bar, and the lower electrode and the lower bus bar are respectively connected in a linear shape by laser welding. 前記上ケースと前記下ケースは、それぞれに設けた固定ネジ穴を介して、両端にメネジを形成した固定棒に固定ネジを締め込むことにより接続固定される請求項１に記載の蓄電ユニット。 2. The power storage unit according to claim 1, wherein the upper case and the lower case are connected and fixed by tightening fixing screws to fixing rods having female screws formed at both ends through fixing screw holes provided in the upper case and the lower case, respectively.
JP2007036088A 2007-02-16 2007-02-16 Electricity accumulating unit Pending JP2008204987A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2007036088A JP2008204987A (en) 2007-02-16 2007-02-16 Electricity accumulating unit
CN200880005101.0A CN101611463B (en) 2007-02-16 2008-02-15 Capacitor unit and its manufacturing method
PCT/JP2008/000229 WO2008099614A1 (en) 2007-02-16 2008-02-15 Capacitor unit and its manufacturing method
EP08710383.4A EP2110824A4 (en) 2007-02-16 2008-02-15 Capacitor unit and its manufacturing method
US12/526,535 US8194393B2 (en) 2007-02-16 2008-02-15 Capacitor unit and its manufacturing method

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Cited By (8)

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JP2010055885A (en) * 2008-08-27 2010-03-11 Yazaki Corp Power supply device
WO2012042995A1 (en) * 2010-09-30 2012-04-05 Ｊｍエナジー株式会社 Cylindrical electricity storage device and electricity storage device apparatus
WO2012114748A1 (en) * 2011-02-24 2012-08-30 パナソニック株式会社 Capacitor module, and capacitor unit using same
JP2012248284A (en) * 2011-05-25 2012-12-13 Kojima Press Industry Co Ltd Battery holding connection structure
WO2012173233A1 (en) * 2011-06-17 2012-12-20 新神戸電機株式会社 Electrochemical cell module, electrochemical cell module unit, and holder
JP2013149389A (en) * 2012-01-17 2013-08-01 Toyota Industries Corp Terminal connection member, power storage module and vehicle
JP2016189266A (en) * 2015-03-30 2016-11-04 Fdk株式会社 Battery support device
WO2018221214A1 (en) * 2017-06-02 2018-12-06 株式会社オートネットワーク技術研究所 Power storage module

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010055885A (en) * 2008-08-27 2010-03-11 Yazaki Corp Power supply device
WO2012042995A1 (en) * 2010-09-30 2012-04-05 Ｊｍエナジー株式会社 Cylindrical electricity storage device and electricity storage device apparatus
JP5546640B2 (en) * 2010-09-30 2014-07-09 Ｊｍエナジー株式会社 Cylindrical power storage device and power storage device apparatus
WO2012114748A1 (en) * 2011-02-24 2012-08-30 パナソニック株式会社 Capacitor module, and capacitor unit using same
JP2012248284A (en) * 2011-05-25 2012-12-13 Kojima Press Industry Co Ltd Battery holding connection structure
WO2012173233A1 (en) * 2011-06-17 2012-12-20 新神戸電機株式会社 Electrochemical cell module, electrochemical cell module unit, and holder
JPWO2012173233A1 (en) * 2011-06-17 2015-02-23 新神戸電機株式会社 Electrochemical cell module, electrochemical cell module unit and holder
JP2013149389A (en) * 2012-01-17 2013-08-01 Toyota Industries Corp Terminal connection member, power storage module and vehicle
JP2016189266A (en) * 2015-03-30 2016-11-04 Fdk株式会社 Battery support device
WO2018221214A1 (en) * 2017-06-02 2018-12-06 株式会社オートネットワーク技術研究所 Power storage module
JP2018206573A (en) * 2017-06-02 2018-12-27 株式会社オートネットワーク技術研究所 Power storage module

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