JP5255083B2 - Battery pack and battery module - Google Patents

Battery pack and battery module Download PDF

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JP5255083B2
JP5255083B2 JP2011060718A JP2011060718A JP5255083B2 JP 5255083 B2 JP5255083 B2 JP 5255083B2 JP 2011060718 A JP2011060718 A JP 2011060718A JP 2011060718 A JP2011060718 A JP 2011060718A JP 5255083 B2 JP5255083 B2 JP 5255083B2
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middle frame
frame
assembled battery
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JP2011119284A (en
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利明 小貫
健介 後藤
幸太郎 池田
恒美 相羽
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

本発明は組電池および電池モジュールに係り、特に、端部の一方側が正極外部端子として、他方側が負極外部端子として、それぞれ機能する複数の単電池を保持する枠体を備えた組電池および該組電池を複数備えた電池モジュールに関する。 The present invention relates to a battery pack and a battery module, in particular, as one side is a positive electrode external terminal end, as the other side is negative electrode external terminal, the battery pack and said set comprising a frame for holding a plurality of unit cells to function respectively The present invention relates to a battery module including a plurality of batteries .

従来、組電池(集合電池)では、複数個の二次電池(単電池)を電気的に直列あるいは並列接続して高電圧化や高容量化が図られている。複数個の単電池を集合化するには、単電池の端子を導通部材のブスバに溶接して単電池間を直列ないし並列接続したり、正、負極端子に予め加工されたネジ部を設け、または、加工されたネジ部を有する導通部材を正、負極端子に接合し、これらネジ部にブスバを締結固定することにより、直列、並列接続する方法が考案されている。   Conventionally, in an assembled battery (an assembled battery), a plurality of secondary batteries (single cells) are electrically connected in series or in parallel to achieve high voltage and high capacity. In order to assemble a plurality of cells, the terminals of the cells are welded to the bus bar of the conductive member, and the cells are connected in series or in parallel, or provided with pre-processed screw parts on the positive and negative terminals, Alternatively, a method has been devised in which a conductive member having a processed screw portion is joined to positive and negative terminals, and a bus bar is fastened and fixed to these screw portions to connect them in series and in parallel.

一般に、組電池を構成する単電池が、有底金属電池缶を用いた場合のように、容器全体が一方の極性を示すときには、短絡を防止すると共に、組立時の安全性等を確保するために、単電池の容器表面(側周面)は熱収縮チューブまたは絶縁膜等で被覆される。また、各単電池は、絶縁性を有する枠体に保持されることにより、遊動することなく固定される。   In general, when the unit cell constituting the assembled battery uses a bottomed metal battery can, when the entire container shows one polarity, in order to prevent a short circuit and ensure safety during assembly, etc. In addition, the container surface (side peripheral surface) of the unit cell is covered with a heat-shrinkable tube or an insulating film. In addition, each single cell is fixed without floating by being held by an insulating frame.

上述した被覆は導通部材を接続後、あるいは接続前になされ、枠体で各単電池を保持することにより、被覆および導通部材との接続(接合)箇所を振動等の外的な力から保護する組電池が開示されている(例えば、特許文献1参照)。また、本発明者らは、円形窪み状に成形された2つのホルダで4本の円柱状単電池を縦2列横2列に配列し直列接続した組電池を先に提案している(例えば、特許文献2参照)。   The above-described covering is performed after or before connecting the conducting member, and by holding each unit cell with a frame, the connection (joining) location with the covering and the conducting member is protected from external force such as vibration. An assembled battery is disclosed (for example, see Patent Document 1). In addition, the present inventors have previously proposed an assembled battery in which four cylindrical unit cells are arranged in two vertical rows and two horizontal rows with two holders formed in a circular hollow shape and connected in series (for example, , See Patent Document 2).

特開2000−182583号公報JP 2000-182583 A 特開2002−373710号公報JP 2002-373710 A

例えば、自動車用電源等の移動体用電源のように、高電力の電源を必要とする場合に、単電池の総数は数十個に及ぶ。この数十個の単電池を上記の導通部材を介して直列接続する作業は、大変な工数を必要とし、短絡を防ぐという観点からは高コストの電源となってしまう。また、これら導通部材の部品数を低減させるために、単電池間を繋ぐ導通部品、例えば、ブスバを直接溶接あるいは塑性変形等により接続するものが望ましいが、反面、接続された単電池が何らかの不具合を生じた場合、接続された数十個の単電池全てが不良品となってしまう。これに対し、例えば、上述したネジ締結式であれば、電気接続を複数回に亘って行うことができ、不具合を生じた単電池のみを取り替えることが可能である。しかし、この接続形態では締結部品数が増加するため、部品コスト、組立加工費、重量増加等に問題がある。   For example, when a high-power power source is required, such as a mobile power source such as an automobile power source, the total number of single cells reaches several tens. The operation of connecting the tens of unit cells in series via the conductive member requires a great number of man-hours and is a high-cost power source from the viewpoint of preventing a short circuit. Moreover, in order to reduce the number of parts of these conductive members, it is desirable to connect conductive parts that connect the single cells, for example, to connect the bus bars by direct welding or plastic deformation, but on the other hand, the connected single cells have some trouble. If this occurs, all the tens of connected single cells will be defective. On the other hand, for example, with the screw fastening type described above, the electrical connection can be performed a plurality of times, and only the unit cell in which a problem has occurred can be replaced. However, since the number of fastening parts increases in this connection form, there are problems in parts cost, assembly processing cost, weight increase, and the like.

また、単電池がリチウムイオン電池の場合には、各単電池の電圧を検出して監視するためのリード線が接続されなければならず、その接続作業も大変煩雑である。更に、組電池が移動体用電源の場合には、単電池と、導通部材との接続箇所、電圧検出部材との接続箇所や、単電池あるいは複数個の集合電池その物の固定箇所、導通部材や電圧検出部材その物の固定箇所等は耐振性を有していなければならず、この耐振性は個々の形状を、その使用される環境において常に確保しなければならない。とりわけ、移動体用電源においては、その使用される地域、季節等で、その環境は大きく変化する。このため、単電池の外装を構成する電池容器、導通部材、これらを保持固定する絶縁性の枠体等を含む多種多用な部材の集合体である組電池は、振動等の外的応力だけでなく、それらの持つ膨張率の違いから生じる熱応力に対しても考慮する必要がある。一方、多くの単電池で構成された組電池は、各単電池の充放電時の発熱を抑え性能を均一化させるために、各単電池間に形成した空間に冷却風を通過させる必要もある。   Further, when the unit cell is a lithium ion battery, a lead wire for detecting and monitoring the voltage of each unit cell must be connected, and the connection work is very complicated. Furthermore, when the assembled battery is a power source for a moving body, the connection location between the unit cell and the conducting member, the connection location with the voltage detection member, the fixed location of the unit cell or a plurality of assembled batteries, and the conducting member In addition, the voltage detection member itself and its fixed part must have vibration resistance, and this vibration resistance must always ensure the individual shape in the environment in which it is used. In particular, the environment of a mobile power source varies greatly depending on the region and season of use. For this reason, an assembled battery that is an assembly of various members including a battery container, a conductive member, and an insulating frame that holds and fixes these cells is an external stress such as vibration. In addition, it is necessary to consider thermal stress caused by the difference in expansion coefficient between them. On the other hand, an assembled battery composed of many single cells needs to allow cooling air to pass through spaces formed between the single cells in order to suppress heat generation during charge / discharge of each single cell and make the performance uniform. .

更に、工業的に生産される部品は、それ自体に寸法バラツキが生じる。このため、部品間に生じる空間が振動の影響を大きく受け、接続部分や絶縁部の破壊により、電力供給の停止、あるいは短絡による発熱、発火等の問題を引き起こす原因ともなる。また、数十個におよぶ単電池を一括して保持固定する枠は、その形状も複雑であり高コストとなり、それらの組み立て作業も大変煩雑なものとなるため、作業にかかる費用も高価なものとなると共に、各単電池を一括固定した組電池をリサイクルする際には、その組み立て作業以上に解体作業が煩雑化するという問題も生じる。   Furthermore, industrially produced parts have dimensional variations in themselves. For this reason, the space generated between the parts is greatly affected by the vibration, and the connection part and the insulating part are broken, which causes problems such as stoppage of power supply, heat generation due to short circuit, and ignition. In addition, the frame for holding and fixing dozens of single cells at once is complicated and expensive, and the assembly work is very complicated, so the work cost is also expensive. In addition, when the assembled battery in which the single cells are fixed together is recycled, there is a problem that the disassembling work becomes more complicated than the assembling work.

本発明は上記事案に鑑み、組立性の向上を図ることができ組電池および該組電池を複数備えた電池モジュールを提供することを課題とする。 In view of the above circumstances, and an object thereof is to provide a battery module including a plurality of assembled batteries and said set battery Ru can be improved assemblability.

上記課題を解決するために、本発明の第1の態様は、端部の一方側が正極外部端子として、他方側が負極外部端子として、それぞれ機能する複数の単電池と、中枠、及び前記中枠の両側に配置された第1、第2の外枠を備え、前記中枠の一方側と前記第1の外枠とによって複数の前記単電池を挟み込むことにより、さらには、前記中枠の他方側と前記第2の外枠とによって複数の前記単電池を挟み込むことにより、前記複数の単電池を保持する枠体と、前記複数の単電池を電気的に接続する複数の接続導体と、前記複数の単電池のそれぞれの電圧を検出するための電圧検出配線と、を有し、前記中枠は、前記単電池の端部と当接する円弧状の当接部が両側に複数形成された2つの中枠保持部と、前記2つの中枠保持部の間に設けられ、前記2つの中枠保持部を支持する中枠支持部と、前記第1、第2の外枠のそれぞれと嵌合する嵌合部と、を備えており、前記第1、第2の外枠は、それぞれ、前記単電池の端部と当接する円弧状の当接部が前記中枠側に複数形成された2つの中枠保持部と、前記中枠と嵌合する嵌合部と、を備えており、前記中枠と、前記第1、第2の外枠のそれぞれとは、前記中枠の前記嵌合部と、前記第1、第2の外枠のそれぞれの嵌合部とが嵌合することにより結合されており、前記複数の単電池は、前記中枠の両側には配設されて、それぞれの端部が、前記中枠の前記当接部と前記第1の外枠或いは前記第2の外枠の前記当接部との間に挟みこまれた状態で保持されている、ことを特徴とする。 In order to solve the above-mentioned problem, a first aspect of the present invention is a plurality of single cells that function as one side of an end portion as a positive electrode external terminal and the other side as a negative electrode external terminal, a middle frame, and the middle frame. A plurality of single cells sandwiched between one side of the middle frame and the first outer frame, and further, the other of the middle frame. A plurality of unit cells sandwiched between a side and the second outer frame to hold the plurality of unit cells, a plurality of connection conductors for electrically connecting the plurality of unit cells, A voltage detection wiring for detecting a voltage of each of the plurality of unit cells, and the inner frame has a plurality of arc-shaped contact portions that are in contact with the end portions of the unit cells. Provided between the two middle frame holding portions and the two middle frame holding portions, A middle frame support portion that supports the middle frame holding portion, and a fitting portion that fits with each of the first and second outer frames, wherein the first and second outer frames are: Each includes two middle frame holding portions in which a plurality of arc-shaped abutting portions that abut the end portions of the unit cells are formed on the middle frame side, and fitting portions that fit into the middle frame. The inner frame and each of the first and second outer frames are fitted to the fitting portion of the middle frame and the fitting portions of the first and second outer frames. The plurality of single cells are disposed on both sides of the middle frame, and the respective end portions are connected to the contact portion of the middle frame and the first outer frame or the first frame. It is hold | maintained in the state pinched | interposed between the said contact parts of a 2nd outer frame, It is characterized by the above-mentioned.

第1の態様では、第1または第2の外枠を基準に単電池を配設して中枠と第1または第2の外枠とで単電池を挟み、中枠と第2または第1の外枠とで単電池を挟むことで中枠の両側に単電池が配設され、中枠と第1および第2の外枠とを結合することで、組電池を構成する複数の単電池が枠体に保持されるので、組電池の組立作業が簡便なり、組立性の向上を図ることができる In the first aspect , the single cell is disposed with reference to the first or second outer frame, and the single cell is sandwiched between the middle frame and the first or second outer frame, and the middle frame and the second or first frame. A single battery is disposed on both sides of the middle frame by sandwiching the single battery between the outer frame and a plurality of single cells constituting the assembled battery by coupling the middle frame and the first and second outer frames. Is held by the frame body, the assembly work of the assembled battery becomes simple and the assemblability can be improved .

第1の態様において、当接部には、単電池の端部を位置決めするための位置決め部が形成されていてもよい。また、当接部には、接合材を充填するための円弧状の溝部が形成されていてもよい。さらに、複数の単電池は、単電池間が離間するように保持されることによって、冷却風が通る通風路を形成していることが好ましい。また、複数の接続導体は、それぞれ、中枠に装着された状態で、単電池の正極外部端子及び負極外部端子に溶接されていてもよい。さらに、嵌合部を、嵌合穴、及び嵌合穴に嵌合する突起によって構成してもよい。また、電圧検出配線の一方にはコネクタが設けられていてもよい。 1st aspect WHEREIN: The positioning part for positioning the edge part of a cell may be formed in the contact part. Moreover, the contact part may be formed with an arcuate groove for filling the bonding material. Furthermore, it is preferable that the plurality of single cells form a ventilation path through which the cooling air passes by being held so that the single cells are separated from each other. Further, the plurality of connection conductors may be welded to the positive electrode external terminal and the negative electrode external terminal of the unit cell, respectively, in a state of being attached to the middle frame. Furthermore, you may comprise a fitting part by the protrusion fitted to a fitting hole and a fitting hole. A connector may be provided on one of the voltage detection wirings.

また、上記課題を解決するために、本発明の第2の態様は、第1の態様の組電池を複数備えた電池モジュールである。Moreover, in order to solve the said subject, the 2nd aspect of this invention is a battery module provided with two or more assembled batteries of a 1st aspect.

本発明によれば、第1または第2の外枠を基準に単電池を配設して中枠と第1または第2の外枠とで単電池を挟み、中枠と第2または第1の外枠とで単電池を挟むことで中枠の両側に単電池が配設され、中枠と第1および第2の外枠とを結合することで、組電池を構成する複数の単電池が枠体に保持されるので、組電池の組立作業が簡便なり、組立性の向上を図ることができる、という効果を得ることができる。 According to the present invention, a single cell is disposed with reference to the first or second outer frame, and the single cell is sandwiched between the middle frame and the first or second outer frame, and the middle frame and the second or first frame. A single battery is disposed on both sides of the middle frame by sandwiching the single battery between the outer frame and a plurality of single cells constituting the assembled battery by coupling the middle frame and the first and second outer frames. Is held by the frame body, the assembly work of the assembled battery becomes simple, and the effect that the assemblability can be improved can be obtained.

本発明が適用可能な実施形態の電池モジュールの外観斜視図である。It is an external appearance perspective view of the battery module of embodiment which can apply this invention. 実施形態の電池モジュールを構成する組電池の正面側から見た外観斜視図である。It is the external appearance perspective view seen from the front side of the assembled battery which comprises the battery module of embodiment. 実施形態の電池モジュールを構成する組電池の背面側から見た外観斜視図である。It is the external appearance perspective view seen from the back side of the assembled battery which comprises the battery module of embodiment. 組電池の中枠の外観斜視図である。It is an external appearance perspective view of the middle frame of an assembled battery. コネクタ付き電圧検出線が固定された中枠の外観斜視図である。It is an external appearance perspective view of the inner frame to which the voltage detection line with a connector was fixed. 正面側から見た組電池の分解斜視図である。It is a disassembled perspective view of the assembled battery seen from the front side. 背面側から見た組電池の分解斜視図である。It is a disassembled perspective view of the assembled battery seen from the back side.

以下、図面を参照して、本発明を電気自動車用の電池モジュール(集合組電池)に適用した実施の形態について説明する。   Hereinafter, an embodiment in which the present invention is applied to a battery module (assembled assembled battery) for an electric vehicle will be described with reference to the drawings.

(構成)
図1に示すように、本実施形態の電池モジュール50は、3個の組電池を備え、これらの組電池1が直列に接続されている。
(Constitution)
As shown in FIG. 1, the battery module 50 of this embodiment includes three assembled batteries, and these assembled batteries 1 are connected in series.

図2および図3に示すように、組電池1は、4個の円柱状リチウムイオン電池14(以下、単電池14という。)、単電池14を保持する枠体、単電池14間を接続する接続部材(ブスバ)、単電池14の電圧を検出するための電圧検出用リード線を有して構成されている。   As shown in FIG. 2 and FIG. 3, the assembled battery 1 connects the four cylindrical lithium ion batteries 14 (hereinafter referred to as single cells 14), a frame that holds the single cells 14, and the single cells 14. The connecting member (bus bar) is configured to have a voltage detection lead wire for detecting the voltage of the unit cell 14.

各単電池14は、有底円筒状の金属容器内に正極および負極を、セパレータを介して捲回した電極群が配置されており、電極群は非水電解液に浸潤されている。図6および図7に示すように、金属容器17の上部は、円盤状の正極蓋16とガスケットを介してカシメ封口されている。捲回群を構成する正極は上蓋16に接続されており、負極は電池容器17に接続されている。また、単電池14の側周面は熱収縮チューブ15で覆われている。このため、外部に露出し単電池14の両端に位置する正極蓋16の端面および金属容器17の底部端面が外部端子としての機能を有している。   Each unit cell 14 includes an electrode group in which a positive electrode and a negative electrode are wound through a separator in a bottomed cylindrical metal container, and the electrode group is infiltrated with a non-aqueous electrolyte. As shown in FIGS. 6 and 7, the upper part of the metal container 17 is caulked and sealed through a disc-shaped positive electrode lid 16 and a gasket. The positive electrode constituting the wound group is connected to the upper lid 16, and the negative electrode is connected to the battery container 17. Further, the side peripheral surface of the unit cell 14 is covered with a heat shrinkable tube 15. For this reason, the end surface of the positive electrode lid 16 exposed to the outside and located at both ends of the unit cell 14 and the bottom end surface of the metal container 17 have functions as external terminals.

上述した枠体には電気絶縁性の樹脂製材料が用いられている。枠体は、同一形状の2つの外枠2と、中枠3とで構成されている。単電池14は、中枠3と一方の外枠2および該一方の外枠2と上下対称に配置された他方の外枠2で挟まれており、中枠3を介して、隣接する単電池2間で端子方向(図6、7の左右方向)が逆方向となるように2行2列の正方直交状に配設されている。   An electrically insulating resin material is used for the frame described above. The frame is composed of two outer frames 2 and an inner frame 3 having the same shape. The unit cell 14 is sandwiched between the middle frame 3, one outer frame 2, and the other outer frame 2 arranged vertically symmetrically with the one outer frame 2, and the adjacent unit cell via the middle frame 3. They are arranged in a 2 × 2 square orthogonal manner so that the terminal direction (left and right direction in FIGS. 6 and 7) is opposite between the two.

外枠2は、単電池14の正、負極端部に外側から当接して単電池14を保持する2つの外枠保持部18と、これらの外枠保持部18間の間隔を画定し、外枠保持部18と一体成形された外枠支持部19とを有している。2つの外枠保持部18は同一形状を有しており、外枠支持部19に左右対称に固定されている。外枠支持部19は、組電池1の軽量化を図ると共に、所定の強度を持たせるために、断面略U字状の形状を有している。   The outer frame 2 defines two spaces between the outer frame holding portions 18 and two outer frame holding portions 18 that hold the single cells 14 by contacting the positive and negative electrode ends of the single cells 14 from the outside. It has a frame holding part 18 and an outer frame support part 19 formed integrally. The two outer frame holding portions 18 have the same shape, and are fixed to the outer frame support portion 19 symmetrically. The outer frame support portion 19 has a substantially U-shaped cross section in order to reduce the weight of the assembled battery 1 and to have a predetermined strength.

外枠保持部18の単電池14の正、負極端部に当接する箇所(2箇所)には円弧状の当接部32が形成されている。当接部32には、単電池14の正、負極端部を当接部32に固定するために、接着剤等の接合材を充填するための溝部が形成されている。この溝部は、当接部32の円弧状に沿う方向に形成された円弧状溝部20と、円弧状溝部20の中央および両端で円弧状溝部20に直角に交差する方向に形成された交差溝部21とを有している。   Arc-shaped contact portions 32 are formed at locations (two locations) in contact with the positive and negative end portions of the unit cell 14 of the outer frame holding portion 18. In the contact portion 32, a groove portion for filling a bonding material such as an adhesive is formed in order to fix the positive and negative end portions of the unit cell 14 to the contact portion 32. The groove portion includes an arcuate groove portion 20 formed in a direction along the arc shape of the contact portion 32, and an intersecting groove portion 21 formed in a direction perpendicular to the arcuate groove portion 20 at the center and both ends of the arcuate groove portion 20. And have.

外枠保持部18には、外枠支持部19が固定された反対面側(外側)で上述した当接部32に沿う方向に、円弧状で、単電池14の正負極端の面位置(単電池の先端位置)を画定するための位置決め部29が一体形成されている。また、外枠保持部18には、当接部32が形成された反対面側の両隅部に、組電池1の位置決めないし組電池1の固定をするためのU字状の位置決め溝部28が形成されている。更に、外枠保持部18には、雌ネジからなり、組電池1を外枠支持部19が固定された反対面側から固定するための組電池固定部27が形成されている。   The outer frame holding portion 18 has an arc shape in the direction along the contact portion 32 described above on the opposite surface side (outer side) to which the outer frame support portion 19 is fixed (surface position (single unit) of the unit cell 14. A positioning portion 29 for defining the tip position of the battery is integrally formed. Further, the outer frame holding portion 18 has U-shaped positioning groove portions 28 for positioning the assembled battery 1 or fixing the assembled battery 1 at both corners on the opposite surface side where the contact portions 32 are formed. Is formed. Further, the outer frame holding portion 18 is formed with an internal thread, and an assembled battery fixing portion 27 for fixing the assembled battery 1 from the opposite surface side to which the outer frame supporting portion 19 is fixed is formed.

また、外枠保持部18の外枠支持部19と直交する側の端部両側は中枠3側に向けて延出されている。この中枠3側に延出された端部の先端部には矩形状の第1の嵌合穴33が形成されている。外枠2は2つの外枠保持部18を有しているため、外枠2には4つの第1の嵌合穴33が形成されている。更に、外枠保持部18には、外枠支持部19が固定された反対面側で上述した位置決め部29間を繋ぐ中央の端部に矩形状の窪みが形成されており、この矩形状の窪みには第1の突起34が突設されている。なお、外枠保持部18の当接部32間を繋ぐ中央は、軽量化を図るため、矩形溝状に肉抜きが施されている。   Further, both ends of the outer frame holding portion 18 on the side orthogonal to the outer frame support portion 19 are extended toward the middle frame 3 side. A rectangular first fitting hole 33 is formed at the tip of the end extending to the inner frame 3 side. Since the outer frame 2 has the two outer frame holding portions 18, four first fitting holes 33 are formed in the outer frame 2. Further, the outer frame holding portion 18 is formed with a rectangular recess at a central end portion connecting the positioning portions 29 described above on the opposite surface side to which the outer frame support portion 19 is fixed. A first protrusion 34 projects from the recess. In addition, the center which connects between the contact parts 32 of the outer frame holding | maintenance part 18 is thinned in the shape of a rectangular groove | channel in order to attain weight reduction.

図4〜図7に示すように、中枠3は、単電池14の正、負極端部に内側から当接して単電池14を保持する2つの中枠保持部30と、これらの中枠保持部30間の間隔を画定し、中枠保持部30と一体成形された中枠支持部10とを有している。2つの中枠保持部30はほぼ同一形状を有しており、中枠支持部10に向き合うように固定されている。   As shown in FIGS. 4 to 7, the middle frame 3 includes two middle frame holding portions 30 that hold the unit cells 14 by contacting the positive and negative electrode ends of the unit cells 14 from the inside, and these middle frame holdings. A space between the portions 30 is defined, and the middle frame holding portion 30 and the middle frame supporting portion 10 integrally formed are provided. The two middle frame holding portions 30 have substantially the same shape, and are fixed so as to face the middle frame support portion 10.

中枠支持部10は、所定の強度を持たせ軽量化を図ると共に、電圧検出用リード線が沿い、かつ、電圧検出用リード線が組電池1内を流通する冷却風でばたつかないように、更に、冷却風を整流するために、短冊状の形状を有している。中枠支持部10には、複数のリード線固定部12が形成されており、電圧検出用リード線は図示しない結束バンドで中枠支持部10に固定されている。電圧検出用リード線の一側には、複数の電圧検出用リード線を集結するためのコネクタが予め取り付けられており、コネクタ付き電圧検出用リード線4として一体に取り扱われる。なお、中枠支持部10が中枠保持部30間を画定する間隔と、外枠支持部19が外枠保持部18間を画定する間隔とは同一寸法に設定されている。   The middle frame support portion 10 has a predetermined strength to reduce the weight, and the voltage detection lead wires follow and the voltage detection lead wires do not flutter with the cooling air flowing through the assembled battery 1. Furthermore, in order to rectify the cooling air, it has a strip shape. A plurality of lead wire fixing portions 12 are formed on the middle frame support portion 10, and the voltage detection lead wires are fixed to the middle frame support portion 10 with a binding band (not shown). A connector for collecting a plurality of voltage detection lead wires is attached in advance to one side of the voltage detection lead wire, and is integrally handled as a voltage detection lead wire 4 with a connector. It should be noted that the interval at which the middle frame support portion 10 delimits between the middle frame holding portions 30 and the interval at which the outer frame support portion 19 demarcates between the outer frame holding portions 18 are set to the same size.

中枠保持部30の単電池14の正、負極端部に当接する箇所(4箇所)には円弧状の当接部32が形成されている。この当接部32には、上述した外枠2の当接部32と同様に、単電池14の正、負極端部を当接部32に固定するために、接着剤等の接合材を充填するための溝部が形成されており、当接部32の円弧状に沿う方向に形成された円弧状溝部20と、円弧状溝部20の中央および両端で円弧状溝部20に直角に交差する方向に形成された交差溝部21とを有している。   Arc contact portions 32 are formed at locations (four locations) that contact the positive and negative end portions of the unit cell 14 of the middle frame holding portion 30. In the same manner as the contact portion 32 of the outer frame 2 described above, the contact portion 32 is filled with a bonding material such as an adhesive to fix the positive and negative end portions of the unit cell 14 to the contact portion 32. In the direction intersecting the arcuate groove 20 at the center and both ends of the arcuate groove 20 at a right angle. And a crossing groove portion 21 formed.

中枠保持部30には、中枠保持部30に形成された当接部32を中枠支持部10が固定された反対面側(外側)で塞ぎ、単電池14の正負極端の面位置(単電池の先端位置)を画定するための位置決め部29が一体形成されている。ただし、コネクタ付き電圧検出用リード線4が導出された側の中枠保持部30の下方2箇所には、上述した外枠保持部18と同様に、円弧状の位置決め部29が一体形成されている。また、中枠保持部30の中枠支持部10と直交する側の端部両側の上下には、外枠保持部18から延出された端部が収容可能な矩形溝部が形成されている(合決構造が採られている)。この矩形溝部には、上述した第1の嵌合穴33に嵌合する第2の突起35が突設されている。中枠3は2つの中枠保持部30を有しており、中枠支持部10と直交する側の端部両側の上下に第2の突起35が突設されているため、中枠3には8つの第2の突起35が突設されている。   In the middle frame holding part 30, the contact part 32 formed on the middle frame holding part 30 is closed on the opposite surface side (outside) to which the middle frame support part 10 is fixed, and the surface position of the positive and negative ends of the unit cell 14 ( A positioning part 29 for defining the tip position of the unit cell is integrally formed. However, similarly to the outer frame holding portion 18 described above, an arc-shaped positioning portion 29 is integrally formed at two locations below the middle frame holding portion 30 on the side where the voltage detection lead wire 4 with connector is led out. Yes. In addition, rectangular grooves that can accommodate the ends extended from the outer frame holding portion 18 are formed on both sides of the end portion on the side orthogonal to the middle frame supporting portion 10 of the middle frame holding portion 30 ( A consensus structure is adopted). The rectangular groove is provided with a second protrusion 35 that fits into the first fitting hole 33 described above. The middle frame 3 has two middle frame holding portions 30, and the second protrusions 35 are provided on the upper and lower sides of the end on the side orthogonal to the middle frame support portion 10. Is provided with eight second protrusions 35.

また、中枠保持部30には、中枠保持部30に形成された当接部32を中枠支持部10が固定された反対面側で塞ぐ位置決め部29間の中央に、位置決め部29と同じ厚さで外枠2側に向けて延出した上下延出部が一体形成されている。上下延出部の先端部は、外枠保持部18の位置決め部29間を繋ぐ中央の端部に形成された溝部に収容されるように合決構造が採られており、第1の突起34が嵌合する矩形状の第2の嵌合穴36が形成されている。   Further, the middle frame holding portion 30 includes a positioning portion 29 and a center portion between the positioning portions 29 that block the contact portion 32 formed on the middle frame holding portion 30 on the opposite surface side to which the middle frame supporting portion 10 is fixed. A vertically extending portion that extends toward the outer frame 2 with the same thickness is integrally formed. The leading end of the vertically extending portion has a consensus structure so as to be accommodated in a groove formed at a central end portion connecting the positioning portions 29 of the outer frame holding portion 18, and the first protrusion 34. A rectangular second fitting hole 36 into which is fitted is formed.

中枠保持部30には、4個の単電池14を直列接続するために複数のブスバが固定されている。すなわち、コネクタ付き電圧検出用リード線4が導出された側の中枠保持部30(図6の左側の中枠保持部30)には、中枠支持部10が固定された反対面側に、位置決め部29の上方に延出され略逆L字(鈍角)状の正極端子ブスバ5と、位置決め部29の上方に延出され略L字(鈍角)状の負極端子ブスバ6と、上下延出部の下部側で略水平方向の両側に延出された単電池間ブスバ7とが、それぞれ、突出したブスバ固定部13により固定されている。正極端子ブスバ5および負極端子ブスバ6は、ブスバ固定部13より外側の位置にそれぞれ雌ネジ部11を有しており、これら雌ネジ部11の中心は略水平直線上に配置されている。   A plurality of bus bars are fixed to the middle frame holding portion 30 in order to connect the four unit cells 14 in series. That is, the middle frame holding part 30 (the left middle frame holding part 30 in FIG. 6) from which the voltage detection lead wire 4 with a connector is led is on the opposite side to which the middle frame support part 10 is fixed. A substantially inverted L-shaped (obtuse angle) positive electrode terminal bus bar 5 extending above the positioning portion 29, a substantially L-shaped (obtuse angle) negative electrode terminal bus bar 6 extending above the positioning portion 29, and a vertical extension The inter-cell bus bars 7 extending on both sides in the substantially horizontal direction on the lower side of the section are fixed by the protruding bus bar fixing portions 13 respectively. Each of the positive terminal bus bar 5 and the negative terminal bus bar 6 has a female screw part 11 at a position outside the bus bar fixing part 13, and the center of the female screw part 11 is arranged on a substantially horizontal straight line.

一方、コネクタ付き電圧検出用リード線4が導出された側の中枠保持部30に対向する側の中枠保持部30(図6の右側の中枠保持部30)には、中枠支持部10が固定された反対面側に、位置決め部29の上下(略垂直)方向の両側に延出された2つの単電池間ブスバ7が、それぞれ、突出したブスバ固定部13により固定されている。なお、2つの単電池間ブスバ7のうち位置決め部29の上方に(単電池14の端子側に)延出された部分は、それぞれ、正極端子ブスバ5、負極端子ブスバ6の位置決め部29の上方に延出された部分に対向する位置に配設されている。   On the other hand, the middle frame support portion 30 (the right middle frame holding portion 30 in FIG. 6) facing the middle frame holding portion 30 on the side where the voltage detection lead wire 4 with connector is led out has a middle frame support portion. Two inter-cell bus bars 7 extending on both sides in the vertical (substantially vertical) direction of the positioning portion 29 are fixed by protruding bus bar fixing portions 13 on the opposite surface side to which 10 is fixed. Of the two inter-cell bus bars 7, the portions extending above the positioning portion 29 (to the terminal side of the single cell 14) are above the positioning portions 29 of the positive terminal bus bar 5 and the negative terminal bus bar 6, respectively. It is arrange | positioned in the position facing the part extended in this.

正極端子ブスバ5、負極端子ブスバ6および単電池間ブスバ7の単電池14の端子側に延出された部分は二股に分かれており、二股に分かれたそれぞれの延出部分には単電池14の端子とスポット溶接を行うための円形穴が形成されている。   The portion of the positive terminal bus bar 5, the negative terminal bus bar 6, and the inter-cell bus bar 7 that extends to the terminal side of the unit cell 14 is divided into two forks, and each of the extended portions divided into the two forks is divided into two parts. A circular hole is formed for spot welding with the terminal.

コネクタ付き電圧検出用リード線4は、リード線先端部に棒状圧着端子9を有している。正極端子ブスバ5、負極端子ブスバ6および単電池間ブスバ7は、それぞれ、棒状圧着端子9が接続固定される(棒状圧着端子9を保持する)略円筒状の圧着端子嵌合部8を有している。   The voltage detection lead wire 4 with a connector has a rod-like crimp terminal 9 at the tip of the lead wire. Each of the positive terminal bus bar 5, the negative terminal bus bar 6 and the inter-cell bus bar 7 has a substantially cylindrical crimp terminal fitting portion 8 to which the rod-shaped crimp terminal 9 is connected and fixed (holds the rod-shaped crimp terminal 9). ing.

また、中枠保持部30にも、コネクタ付き電圧検出用リード線4のリード線部が振動等の外力によるばたつきを防止するために、リード線部を固定するためのリード線固定部12が突設されている。なお、中枠保持部30の中枠支持部10が固定された反対面側の略中央は、コネクタ付き電圧検出用リード線4のリード線部を貫通させると共に、組電池1の軽量化を図るために、肉抜きが施されている。   Further, the lead wire fixing portion 12 for fixing the lead wire portion also protrudes from the middle frame holding portion 30 in order to prevent the lead wire portion of the voltage detecting lead wire 4 with the connector from flapping due to external force such as vibration. It is installed. The substantially central portion on the opposite side to which the middle frame support portion 10 of the middle frame holding portion 30 is fixed penetrates the lead wire portion of the voltage detection lead wire 4 with a connector and reduces the weight of the assembled battery 1. For this reason, the meat is cut out.

図2および図3に示すように、組電池1は、上述した円弧状溝部20および交差溝部21に接合材が充填されており、4個の単電池14が、中枠3を介して、同一側および上下側でその極性が交互となるように配設され枠体に固定されている。また、側面結合部23で上述した第1の突起34は第2の嵌合穴36に嵌合しており、上下結合部24で第2の突起35は第1の嵌合穴33に嵌合し、2つの外枠2と中枠3とで構成された枠体は一体化されている。なお、第1の突起34と第2の嵌合穴36との嵌合する方向と、第2の突起35が第1の嵌合穴33に嵌合する方向とは直交している。   As shown in FIG. 2 and FIG. 3, the assembled battery 1 has the arc-shaped groove portion 20 and the intersecting groove portion 21 filled with the bonding material, and the four unit cells 14 are the same through the middle frame 3. It arrange | positions so that the polarity may become alternate by the side and the up-and-down side, and is fixed to the frame. Further, the first protrusion 34 described above in the side coupling portion 23 is fitted in the second fitting hole 36, and the second projection 35 is fitted in the first fitting hole 33 in the upper and lower coupling portion 24. And the frame comprised by the two outer frames 2 and the middle frame 3 is integrated. The direction in which the first protrusion 34 and the second fitting hole 36 are fitted is orthogonal to the direction in which the second protrusion 35 is fitted in the first fitting hole 33.

更に、単電池14の外部に露出した正極端子、負極端子は、それぞれ、正極端子ブスバ5、負極端子ブスバ6および単電池間ブスバ7に接合(スポット溶接)されている。また、コネクタ付き電圧検出用リード線4のリード線部はリード線固定部12に固定され、リード線先端部の棒状圧着端子9が圧着端子嵌合部8に圧着されている。従って、棒状圧着端子9と圧着端子嵌合部8とは塑性変形されて接続されている。なお、組電池1を構成する単電池14間は離間しており、側面側から組電池1の上部、組電池14間、下部を冷却風が流通するように、冷却通風路22が形成されている。   Further, the positive electrode terminal and the negative electrode terminal exposed to the outside of the unit cell 14 are joined (spot welded) to the positive electrode terminal bus bar 5, the negative electrode terminal bus bar 6 and the inter-cell bus bar 7, respectively. Further, the lead wire portion of the voltage detecting lead wire 4 with the connector is fixed to the lead wire fixing portion 12, and the rod-like crimp terminal 9 at the tip end portion of the lead wire is crimped to the crimp terminal fitting portion 8. Therefore, the rod-shaped crimp terminal 9 and the crimp terminal fitting portion 8 are plastically deformed and connected. The unit cells 14 constituting the assembled battery 1 are separated from each other, and a cooling air passage 22 is formed so that the cooling air flows from the side surface to the upper part of the assembled battery 1, between the assembled batteries 14, and the lower part. Yes.

図1に示すように、電池モジュール50は、3個の組電池1が横並びに配設されており、隣接する組電池1同士の負極端子ブスバ6と正極端子ブスバ5とが組電池間ブスバ25で導通されている。組電池間ブスバ25は、両側で、負極端子ブスバ6の雌ネジ部11および正極端子ブスバ5の雌ネジ部11に螺合するキャップボルト26で締結されている。上述した組電池1は4個の単電池1が直列接続されているため、約12Vの定格電圧となり、電池モジュール50は、組電池1を3個備えているので、約36Vの定格電圧を有している。   As shown in FIG. 1, the battery module 50 includes three assembled batteries 1 arranged side by side, and the negative terminal bus bus 6 and the positive terminal bus bar 5 between the adjacent assembled batteries 1 are inter-battery bus bars 25. Conducted with. The inter-battery bus bar 25 is fastened on both sides by cap bolts 26 that are screwed into the female screw part 11 of the negative terminal bus bar 6 and the female screw part 11 of the positive terminal bus bar 5. The above-mentioned assembled battery 1 has a rated voltage of about 12V because four unit cells 1 are connected in series, and the battery module 50 has three assembled batteries 1 and therefore has a rated voltage of about 36V. doing.

電池モジュール50を構成する各組電池1は、図示を省略したレール状の架台に固定されている。各組電池1には外枠保持部18に位置決め溝部28が形成されているので、架台に位置決め溝部28に係合する突起を形成することで各組電池1の位置決めないし固定がなされている。   Each assembled battery 1 constituting the battery module 50 is fixed to a rail-shaped gantry not shown. Since each assembled battery 1 has a positioning groove 28 formed in the outer frame holding portion 18, each assembled battery 1 is positioned or fixed by forming a projection that engages with the positioning groove 28 on the frame.

また、電池モジュール50は、図示を省略したケーシング内に収容されており、上述した冷却通風路22には外部から冷却風が導入可能な構造を有している。なお、図示を省略したレール状の架台はケーシングに固定されている。最上位の組電池1の正極端子ブスバ5および最下位の組電池1の負極端子ブスバ5には、不図示のキャップボルトを介して電池モジュール50の正極外部出力端子および負極外部出力端子まで導出される。電池モジュール50の仕様に応じて、この導出経路中にヒューズ等が挿入される場合もある。なお、各組電池1のコネクタ付き電圧検出用リード線4のコネクタは、電池モジュール50を構成する単電池1の電圧を監視するためのセルコントローラから導出されたコネクタ(不図示)に接続されている。   The battery module 50 is housed in a casing (not shown), and the cooling air passage 22 has a structure in which cooling air can be introduced from the outside. In addition, the rail-shaped mount which abbreviate | omitted illustration is being fixed to the casing. The positive electrode terminal bus bar 5 of the uppermost assembled battery 1 and the negative electrode terminal bus bar 5 of the lowermost assembled battery 1 are led to the positive external output terminal and the negative external output terminal of the battery module 50 through cap bolts (not shown). The Depending on the specifications of the battery module 50, a fuse or the like may be inserted into the lead-out path. In addition, the connector of the voltage detection lead wire 4 with the connector of each assembled battery 1 is connected to a connector (not shown) derived from a cell controller for monitoring the voltage of the unit cell 1 constituting the battery module 50. Yes.

(組立手順)
次に、本実施形態の電池モジュール50の組立手順について、組電池1の組立手順を中心に説明する。なお、組立前に、正極端子ブスバ5、負極端子ブスバ6、単電池間ブスバ7およびコネクタ付き電圧検出線用リード線4は中枠3に固定されており、コネクタ付き電圧検出線用リード線4のリード線部は中枠支持部10および中枠保持部30のリード線固定部12に固定されていると共に、棒状圧着端子9は圧着端子嵌合部8に嵌合されており、中枠3は正極端子ブスバ5、負極端子ブスバ6、単電池間ブスバ7およびコネクタ付き電圧検出線用リード線4を有するアセンブリないしユニットとして部品管理がなされている。
(Assembly procedure)
Next, the assembly procedure of the battery module 50 of the present embodiment will be described focusing on the assembly procedure of the assembled battery 1. Before assembly, the positive terminal bus bar 5, the negative terminal bus bar 6, the inter-cell bus bar 7, and the voltage detection line lead wire 4 with connector are fixed to the inner frame 3, and the voltage detection line lead wire 4 with connector is attached. The lead wire portion is fixed to the middle frame support portion 10 and the lead wire fixing portion 12 of the middle frame holding portion 30, and the rod-like crimp terminal 9 is fitted to the crimp terminal fitting portion 8. The parts are managed as an assembly or unit having the positive terminal bus bar 5, the negative terminal bus bar 6, the inter-cell bus bar 7 and the voltage detection line lead wire 4 with connector.

図6および図7に示すように、2つの外枠2のうち一方の外枠2を当接部32側が上方を向くように載置して、円弧状溝部20および交差溝部21に接合材を充填し、位置決め部29を基準に(単電池14の端面が当接するように)当接部32上に2つの単電池14を極性が交互となるように載置する。続いて、中枠保持部30の下側の円弧状溝部20および交差溝部21に接合材を充填し、位置決め部29を基準に、外枠2に保持された単電池14の正、負極端部に中枠保持部30の当接部32を当接させ、側面結合部23および上下結合部24で一方の(下側に載置された)外枠2と中枠3とを一体化させる。   As shown in FIGS. 6 and 7, one outer frame 2 of the two outer frames 2 is placed so that the contact portion 32 side faces upward, and a bonding material is applied to the arc-shaped groove portion 20 and the intersecting groove portion 21. After filling, the two unit cells 14 are placed on the contact portion 32 so that the polarities are alternated with respect to the positioning portion 29 (so that the end surface of the unit cell 14 contacts). Subsequently, the arcuate groove portion 20 and the cross groove portion 21 below the middle frame holding portion 30 are filled with a bonding material, and the positive and negative end portions of the unit cell 14 held by the outer frame 2 with reference to the positioning portion 29. Then, the abutting portion 32 of the middle frame holding portion 30 is brought into contact with each other, and the outer frame 2 and the middle frame 3 (mounted on the lower side) are integrated by the side surface coupling portion 23 and the upper and lower coupling portion 24.

次に、中枠保持部30の上側の円弧状溝部20および交差溝部21に接合材を充填し、位置決め部29を基準に、当接部32上に2個の単電池14を、既に外枠2に載置した2つの単電池14との間でも極性が交互となるように載置する。当然、正極端子ブスバ5には単電池14の正極蓋16が位置し、負極端子ブスバ6には負極容器17が位置する。続いて、2つの外枠2のうち他方の外枠2の外枠保持部18の円弧状溝部20および交差溝部21に接合材を充填し、当接部32を下側に向けて、位置決め部29を基準に、中枠3に保持された単電池14の正、負極端部に外枠保持部18の当接部32を当接させ、側面結合部23および上下結合部24で中枠3と他方の外枠2とを一体化させる。なお、接合材がその接合力を発現するまでに時間を要しても、側面結合部23、上下結合部24の結合力で中枠3と2つの外枠2が維持固定される。   Next, the arcuate groove 20 and the crossing groove 21 on the upper side of the middle frame holding part 30 are filled with a bonding material, and the two unit cells 14 are already mounted on the abutment part 32 on the basis of the positioning part 29. 2 are placed so that the polarities are alternated between the two unit cells 14 placed on 2. Naturally, the positive electrode lid 16 of the unit cell 14 is positioned on the positive electrode terminal bus bar 5, and the negative electrode container 17 is positioned on the negative electrode terminal bus bar 6. Subsequently, the arcuate groove 20 and the crossing groove 21 of the outer frame holding portion 18 of the other outer frame 2 of the two outer frames 2 are filled with the bonding material, and the contact portion 32 faces downward, and the positioning portion 29, the abutting portion 32 of the outer frame holding portion 18 is brought into contact with the positive and negative end portions of the unit cell 14 held in the middle frame 3, and the side frame coupling portion 23 and the upper and lower coupling portion 24 serve as the middle frame 3. And the other outer frame 2 are integrated. Even if it takes time for the bonding material to develop its bonding force, the middle frame 3 and the two outer frames 2 are maintained and fixed by the bonding force of the side surface bonding portion 23 and the upper and lower bonding portions 24.

次いで、正極端子ブスバ5、負極端子ブスバ6、単電池間ブスバ7と単電池14とをそれぞれ2箇所でスポット溶接して電気的接続を行い、組電池1の組立が完了する。   Next, the positive terminal bus bar 5, the negative terminal bus bar 6, the inter-cell bus bar 7, and the single cell 14 are spot welded at two locations, respectively, and electrical connection is made, and the assembly of the assembled battery 1 is completed.

以上のように組み立てた3個の組電池1を、ケーシングに固定されたレール状の架台に形成された突起に位置決め溝部28を係合・固定させ、雄ネジにより組電池固定部27をケーシング内で固定する。次いで、組電池1間を組電池間ブスバ25とキャップボルト26とで接続すると共に、不図示のキャップボルトを介して電池モジュール50の正極外部出力端子および負極外部出力端子まで導出する。続いて、セルコントローラから導出されたコネクタを各組電池1のコネクタ付き電圧検出用リード線4のコネクタに接続して、電池モジュール50の組立が完了する。なお、電池モジュール50は、不図示の充電器を介して各単電池14を初充電することにより、電池モジュールとしての機能が付与される。   The three assembled batteries 1 assembled as described above are engaged with and fixed to the positioning grooves 28 on the protrusions formed on the rail-shaped base fixed to the casing, and the assembled battery fixing part 27 is fixed inside the casing by male screws. Secure with. Next, the assembled batteries 1 are connected by the inter-assembled battery bus bar 25 and the cap bolt 26, and led out to the positive external output terminal and the negative external output terminal of the battery module 50 through the unillustrated cap bolt. Subsequently, the connector derived from the cell controller is connected to the connector of the voltage detection lead wire 4 with a connector of each assembled battery 1, and the assembly of the battery module 50 is completed. In addition, the battery module 50 is provided with the function as a battery module by initially charging each cell 14 via a charger (not shown).

(作用等)
次に、本実施形態の電池モジュール50の作用等について、組電池1の作用等を中心に説明する。
(Action etc.)
Next, the operation and the like of the battery module 50 of the present embodiment will be described focusing on the operation and the like of the assembled battery 1.

本実施形態の電池モジュール50を構成する組電池1は、中枠3を介して2つの外枠2で4個の単電池14を保持固定できるので、組電池の組み立て作業が簡便になる。また、2つの外枠2と中枠3とで構成される枠体で保持固定されるため、単電池14間に冷却風を流すための空間を、組立時に形成することが可能となる。更に、枠体の当接部32は単電池14の両端部に位置するため、単電池14の側面の大部分が露呈するため、冷却風との接触面が大きく取ることができ、冷却性能が向上する。   Since the assembled battery 1 constituting the battery module 50 of the present embodiment can hold and fix the four unit cells 14 with the two outer frames 2 via the middle frame 3, the assembly work of the assembled battery becomes simple. Further, since it is held and fixed by a frame constituted by the two outer frames 2 and the middle frame 3, a space for flowing cooling air between the single cells 14 can be formed at the time of assembly. Further, since the abutting portions 32 of the frame body are located at both ends of the unit cell 14, most of the side surface of the unit cell 14 is exposed, so that a large contact surface with the cooling air can be taken, and the cooling performance is improved. improves.

また、中枠3に、コネクタ付き電圧検出線用リード線4、正極端子ブスバ5、負極端子ブスバ6、単電池間ブスバ7を予め固定したため、組立の作業速度が格段に向上し、かつ、その接続作業が簡便になる。更に、コネクタ付き電圧検出線用リード線4は予め正極端子ブスバ5、負極端子ブスバ6、単電池間ブスバ7と接続されているため、作業の簡便さだけでなく、作業時の短絡防止に大いに効果がある。更には、中枠3に接続用の導電部材を集中することができるため、枠体全体を構成する部品コストを低減できると共に、組電池1の小型化を図ることができる。   Moreover, since the lead wire 4 for the voltage detection line with the connector, the positive terminal bus bar 5, the negative terminal bus bar 6, and the inter-cell bus bar 7 are fixed in advance to the middle frame 3, the assembly work speed is remarkably improved, and Connection work is simplified. Furthermore, since the voltage detection lead wire 4 with a connector is previously connected to the positive terminal bus bar 5, the negative terminal bus bar 6, and the inter-cell bus bar 7, not only the work is easy, but also a great short circuit prevention during the work. effective. Furthermore, since the conductive members for connection can be concentrated on the middle frame 3, the cost of components constituting the entire frame can be reduced, and the assembled battery 1 can be downsized.

また、2つの外枠2を同一形状のものを用いたため、組電池1を構成する部品種を少なくすることができ、部品管理が容易となる。更に、外枠保持部18、中枠保持部30には、単電池14の端面および端部側周面が当接する位置決め部29、当接部32が形成されているため、単電池14の配置、位置決め作業を効率的に行うことができる。また、これら外枠保持部18、中枠保持部30間の間隔を画定する外枠支持部19、中枠支持部10を設けたことにより、組み上がった組電池1の外形寸法を決定することができるので、組立作業によるバラツキを少なくすることができる。更にまた、中枠支持部10にコネクタ付き電圧検出用リード線4を固定することにより、振動や冷却風のばたつきによるリード線の磨耗、断線等を防止することができる(信頼性を高めることができる)。   Further, since the two outer frames 2 having the same shape are used, the number of parts constituting the assembled battery 1 can be reduced, and the parts management becomes easy. Further, since the outer frame holding portion 18 and the middle frame holding portion 30 are formed with a positioning portion 29 and a contact portion 32 where the end surface and the end side peripheral surface of the unit cell 14 abut, the arrangement of the unit cell 14 is arranged. , Positioning work can be performed efficiently. In addition, by providing the outer frame support portion 19 and the intermediate frame support portion 10 that define the space between the outer frame holding portion 18 and the middle frame holding portion 30, the outer dimensions of the assembled battery 1 are determined. Therefore, variation due to assembly work can be reduced. Furthermore, by fixing the voltage detection lead wire 4 with a connector to the middle frame support portion 10, it is possible to prevent the lead wire from being worn or disconnected due to vibration or flapping cooling air (increasing reliability). it can).

また、中枠保持部18、外枠保持部19の円弧状の当接部32に形成された円弧状溝部20に接着剤等の接合材を充填して、単電池14を保持固定することにより、振動に強い組電池1を得ることができ、かつ、接合材の弾性力にて熱応力を緩和できる利点がある。更に、当接部32と単電池14の端部側周面の間に、製造バラツキによる空間が生じても、円弧状溝部20に位置する接合材がこの空間に充填されるため、接合力を堅持できる。また、円弧状溝部20と直角に交差する方向に形成された交差溝部21に、円弧状溝部20に充填された接合材の余剰分が移動するため、過剰な接合材で組立時の嵌合作業を阻害することなく、移動した余剰の接合材にて接合面を大きく確保できる。   Also, by filling the arcuate groove 20 formed in the arcuate contact portion 32 of the inner frame holding portion 18 and the outer frame holding portion 19 with a bonding material such as an adhesive, the unit cell 14 is held and fixed. There is an advantage that the assembled battery 1 that is resistant to vibration can be obtained and that the thermal stress can be relaxed by the elastic force of the bonding material. Furthermore, even if a space due to manufacturing variation occurs between the contact portion 32 and the end surface of the unit cell 14, the bonding material positioned in the arc-shaped groove 20 is filled into this space. Can stick. Further, since the surplus portion of the bonding material filled in the arc-shaped groove 20 moves to the intersecting groove 21 formed in a direction perpendicular to the arc-shaped groove 20, fitting work at the time of assembly with an excessive bonding material A large joint surface can be secured by the surplus joining material that has moved.

更に、側面結合部23および上下結合部24で外枠2が中枠3に結合(嵌合)するため、保持冶具等の作業冶具を必要とせず、接合材がその接合力の発現までに時間を要しても、外枠2と中枠3とで構成される枠体の結合が維持されるので、組立加工費を低減することができる。また、側面結合部23と上下結合部24とによる結合(嵌合)方向が直交する方向のため、外枠2と中枠3との結合(嵌合)強度を高めることができる。   Further, since the outer frame 2 is coupled (fitted) to the middle frame 3 at the side coupling part 23 and the upper and lower coupling part 24, a work jig such as a holding jig is not required, and the bonding material takes time to develop its bonding force. Even if required, since the coupling of the frame body constituted by the outer frame 2 and the middle frame 3 is maintained, the assembly processing cost can be reduced. Further, since the coupling (fitting) direction by the side surface coupling part 23 and the upper and lower coupling part 24 is orthogonal, the coupling (fitting) strength between the outer frame 2 and the middle frame 3 can be increased.

また、外枠保持部18、中枠保持部30に形成された位置決め部29により、単電池14の両端面が、既に当接部32に保持された単電池14のいずれか一方の端面と同水準の位置となる(同一面に位置する)ため、溶接等の作業バラツキを最小限に抑えることができ、更に、この位置決め作業を省くことができるので、組立作業が格段に速くなる。   Further, the both end surfaces of the unit cell 14 are the same as either one of the end surfaces of the unit cell 14 already held by the contact portion 32 by the positioning unit 29 formed in the outer frame holding unit 18 and the inner frame holding unit 30. Since the position becomes a standard position (located on the same surface), it is possible to minimize work variations such as welding, and further, since this positioning work can be omitted, the assembling work is significantly faster.

また、組電池1の解体作業は、組電池1の正面および背面に位置する正極端子ブスバ5、負極端子ブスバ6、単電池間ブスバ7の切断または単電池14とこれらブスバの接合部を破壊し、単電池14を覆う熱収縮チューブ15を切断剥離し、外枠支持部10を切断するだけで単電池14と枠体とを分離解体できる。更に、ブスバ固定部13を破壊すれば中枠3とブスバ類を分離解体できる。従って、本実施形態の組電池1は、分別解体が簡易で分別回収が容易な環境に優しい組電池である。   Also, the disassembly work of the assembled battery 1 is performed by cutting the positive terminal bus bar 5, the negative terminal bus bar 6, the inter-cell bus bar 7 located on the front and back of the assembled battery 1 or destroying the joint part between the single cell 14 and these bus bars. The cell 14 and the frame can be separated and disassembled simply by cutting and peeling the heat shrinkable tube 15 covering the cell 14 and cutting the outer frame support 10. Furthermore, if the bus bar fixing part 13 is destroyed, the middle frame 3 and bus bars can be separated and disassembled. Therefore, the assembled battery 1 of the present embodiment is an environmentally friendly assembled battery that is easy to separate and disassemble and easy to separate and collect.

また、本実施形態の電池モジュール50は、上述した組電池1を複数個並べて電気接続する際に、中枠3に固定された正極端子ブスバ5および負極端子ブスバ6に形成した雌ネジ部11に、組電池1間を導通させる組電池間ブスバ25をネジ締結するだけで可能となり、必要とされる電力は組電池1の数を増減させるだけで得られるため、工業的に価値が大きい。更に、コネクタ付き電圧検出用リード線4のコネクタにより、上述のような集合組電池(電池モジュール50)での配線接続が容易で、かつ、誤配線等による短絡を防止することができる。   Further, the battery module 50 of the present embodiment has a female screw portion 11 formed on the positive terminal bus bar 5 and the negative terminal bus bar 6 fixed to the middle frame 3 when a plurality of the assembled batteries 1 described above are arranged and electrically connected. The battery pack 25 between the battery packs that conducts the battery pack 1 can be simply screwed, and the required electric power can be obtained simply by increasing or decreasing the number of battery packs 1. Furthermore, the connector of the voltage detection lead wire 4 with the connector facilitates the wiring connection in the assembled battery (battery module 50) as described above, and can prevent a short circuit due to an incorrect wiring or the like.

また、組電池1の外枠2には位置決め溝部29が形成されており、この位置決め溝部29を基準に固定できると共に、組電池1そのもの、または、組電池1を複数個ならべた集合組電池に耐振動性能を付与できるため、自動車用電源等の移動体用電源に適した性能を発揮できる。また更に、組電池1を構成する単電池14に何らかの不具合が生じた場合には、この不具合単電池14が属する組電池1のみを、新たな組電池1と取り替えることが可能となり、その被害の程度を集合組電池全体から組電池1の単位まで低くすることができる。更にまた、位置決め溝部29を、これら組電池1を搭載するための架台上に設けた突起と嵌合させることにより、位置決めが可能となるので作業効率が格段に向上する。   A positioning groove 29 is formed in the outer frame 2 of the assembled battery 1 and can be fixed with the positioning groove 29 as a reference, and the assembled battery 1 itself or an assembled assembled battery in which a plurality of assembled batteries 1 are arranged. Since vibration-resistant performance can be imparted, performance suitable for mobile power supplies such as automobile power supplies can be exhibited. Furthermore, when any trouble occurs in the unit cell 14 constituting the assembled battery 1, it is possible to replace only the assembled battery 1 to which the defective unit cell 14 belongs with a new assembled battery 1, and the damage is caused. The degree can be lowered from the entire assembled battery to the unit of the assembled battery 1. Furthermore, since the positioning groove 29 is fitted to a protrusion provided on the mount for mounting the assembled battery 1, positioning can be performed, so that the working efficiency is remarkably improved.

なお、本実施形態では、組電池1を3個備え、定格電圧が約36Vの電池モジュール50を例示したが、それ以上の電圧が必要なときは、組電池1の数を増加するだけでよいため、容易に高電圧化を図ることができる。また、本実施形態では、組電池1を4個の単電池14で構成した例を示したが、中枠3および外枠2の当接部32を増減するだけで、組電池1を構成する単電池14の数を増減可能である。   In the present embodiment, the battery module 50 having three assembled batteries 1 and a rated voltage of about 36 V is illustrated. However, when a voltage higher than that is required, the number of the assembled batteries 1 need only be increased. Therefore, it is possible to easily increase the voltage. Moreover, in this embodiment, although the example which comprised the assembled battery 1 by the four unit cells 14 was shown, the assembled battery 1 is comprised only by increasing / decreasing the contact part 32 of the inner frame 3 and the outer frame 2. FIG. The number of unit cells 14 can be increased or decreased.

また、本実施形態では、円柱状電池を単電池として説明したが、角型電池においても、当接部32の形状を角型電池の側面部に沿うようにすれば、同様の効果を得ることができる。また、単電池14には、上述したリチウムイオン電池のみならず、ニッケル水素電池等と充放電可能な電池に利用が可能で、更に、これら電池を主電源、あるいは、ハイブリッド電源とする移動体電源等に用いることができる。   Further, in the present embodiment, the cylindrical battery is described as a single battery, but the same effect can be obtained also in a rectangular battery if the shape of the contact portion 32 is along the side surface of the rectangular battery. Can do. Further, the unit cell 14 can be used not only for the above-described lithium ion battery but also for a battery that can be charged / discharged with a nickel metal hydride battery or the like, and further, a mobile power source using these batteries as a main power source or a hybrid power source. Etc. can be used.

更に、本実施形態では、リード線先端部に棒状圧着端子9を有するコネクタ付き電圧検出用リード線4を例示したが、円柱状の圧着端子を用いるようにしてもよい。また、圧着端子嵌合部8と圧着端子9との圧着に代えて、抵抗溶接で接合したり、ハンダ等の低融点金属で接合するようにしてもよい。更に、本実施形態では、正極端子ブスバ5、負極端子ブスバ6に雌ネジ部11を形成した例を示したが、雄ネジ部を形成しても同様の効果を奏する。また更に、本実施形態では、外枠2に位置決め溝部28を(一体)形成した例を示したが、固定用の穴を形成し、または、外枠保持部18に溝部を切り欠いても同様の効果を奏する。   Furthermore, in this embodiment, although the voltage detection lead wire 4 with a connector which has the rod-shaped crimp terminal 9 in the lead wire front-end | tip part was illustrated, you may make it use a cylindrical crimp terminal. Moreover, it may replace with crimping | compression-bonding of the crimp terminal fitting part 8 and the crimp terminal 9, and you may make it join by low melting metals, such as resistance welding, or solder. Furthermore, in this embodiment, although the example which formed the internal thread part 11 in the positive terminal bus bar 5 and the negative terminal bus bar 6 was shown, there exists the same effect, even if an external thread part is formed. Furthermore, in the present embodiment, an example in which the positioning groove portion 28 is (integrated) formed in the outer frame 2 is shown, but the same is true even if a fixing hole is formed or the groove portion is notched in the outer frame holding portion 18. The effect of.

本発明は組立性の向上を図ることができ、軽量、低コストで信頼性の高い組電池を提供するものであるため、組電池の製造、販売に寄与するので、産業上の利用可能性を有する。   Since the present invention can improve the assemblability and provides a lightweight, low-cost and highly reliable assembled battery, and contributes to the manufacture and sale of the assembled battery. Have.

1 組電池
2 外枠(第1、第2の外枠、枠体の一部)
3 中枠(枠体の一部)
4 コネクタ付き電圧検出用リード線(電圧検出線)
7 単電池間ブスバ(接続導体)
10 中枠支持
14 単電池
18 外枠保持
19 外枠支持
20 円弧状溝
21 交差溝
29 位置決め部
30 中枠保持
32 当接部
33 第1の嵌合穴(中枠と嵌合する嵌合部の一部)
34 第1の突起(中枠と嵌合する嵌合部の一部)
35 第2の突起(第1、第2の外枠のそれぞれと嵌合する嵌合部の一部)
36 第2の嵌合穴(第1、第2の外枠のそれぞれと嵌合する嵌合部の一部)
50 電池モジュール
1 assembled battery 2 outer frame (first and second outer frames, part of the frame)
3 Middle frame (part of the frame)
4 with connector for voltage detection leads (voltage detection wiring)
7 Busbar between cells (connection conductor)
10 middle frame support section 14 unit cells 18 outer frame holding portion 19 outer frame support portion 20 arc-shaped groove portion 21 intersect groove 29 positioning unit 30 middle frame holding portion 32 contact portion 33 first fitting hole (middle frame and Part of the mating part to be mated)
34 1st protrusion (a part of fitting part fitted to an inner frame)
35 2nd protrusion (a part of fitting part fitted to each of 1st, 2nd outer frame)
36 2nd fitting hole (a part of fitting part fitted with each of the 1st, 2nd outer frame)
50 battery modules

Claims (8)

端部の一方側が正極外部端子として、他方側が負極外部端子として、それぞれ機能する複数の単電池と、A plurality of single cells functioning as one side of the end as a positive external terminal and the other side as a negative external terminal,
中枠、及び前記中枠の両側に配置された第1、第2の外枠を備え、前記中枠の一方側と前記第1の外枠とによって複数の前記単電池を挟み込むことにより、さらには、前記中枠の他方側と前記第2の外枠とによって複数の前記単電池を挟み込むことにより、前記複数の単電池を保持する枠体と、An intermediate frame, and first and second outer frames disposed on both sides of the intermediate frame, and by sandwiching the plurality of single cells between one side of the intermediate frame and the first outer frame, Is a frame that holds the plurality of unit cells by sandwiching the plurality of unit cells between the other side of the middle frame and the second outer frame;
前記複数の単電池を電気的に接続する複数の接続導体と、A plurality of connection conductors for electrically connecting the plurality of unit cells;
前記複数の単電池のそれぞれの電圧を検出するための電圧検出配線と、を有し、Voltage detection wiring for detecting each voltage of the plurality of single cells,
前記中枠は、The inner frame is
前記単電池の端部と当接する円弧状の当接部が両側に複数形成された2つの中枠保持部と、Two middle frame holding portions in which a plurality of arc-shaped contact portions that contact the end portions of the unit cells are formed on both sides;
前記2つの中枠保持部の間に設けられ、前記2つの中枠保持部を支持する中枠支持部と、An intermediate frame support provided between the two intermediate frame holders and supporting the two intermediate frame holders;
前記第1、第2の外枠のそれぞれと嵌合する嵌合部と、を備えており、A fitting portion for fitting with each of the first and second outer frames,
前記第1、第2の外枠は、それぞれ、The first and second outer frames are respectively
前記単電池の端部と当接する円弧状の当接部が前記中枠側に複数形成された2つの中枠保持部と、Two middle frame holding portions in which a plurality of arc-shaped contact portions that contact the end portions of the unit cells are formed on the middle frame side;
前記中枠と嵌合する嵌合部と、を備えており、A fitting portion for fitting with the middle frame,
前記中枠と、前記第1、第2の外枠のそれぞれとは、前記中枠の前記嵌合部と、前記第1、第2の外枠のそれぞれの嵌合部とが嵌合することにより結合されており、The middle frame and each of the first and second outer frames are fitted with the fitting portion of the middle frame and the fitting portions of the first and second outer frames. Are combined by
前記複数の単電池は、前記中枠の両側には配設されて、それぞれの端部が、前記中枠の前記当接部と前記第1の外枠或いは前記第2の外枠の前記当接部との間に挟みこまれた状態で保持されている、The plurality of single cells are disposed on both sides of the middle frame, and each end thereof is in contact with the contact portion of the middle frame and the first outer frame or the second outer frame. It is held in a state of being sandwiched between the contact parts,
ことを特徴とする組電池。A battery pack characterized by that.
請求項1に記載の組電池において、The assembled battery according to claim 1,
前記当接部には、前記単電池の端部を位置決めするための位置決め部が形成されている、The contact portion is formed with a positioning portion for positioning the end of the unit cell.
ことを特徴とする組電池。A battery pack characterized by that.
請求項1又は2に記載の組電池において、The assembled battery according to claim 1 or 2,
前記当接部には、接合材を充填するための円弧状の溝部が形成されている、In the contact portion, an arcuate groove for filling the bonding material is formed,
ことを特徴とする組電池。A battery pack characterized by that.
請求項1乃至3のいずれかに記載の組電池において、The assembled battery according to any one of claims 1 to 3,
前記複数の単電池は、前記単電池間が離間するように保持されることによって、冷却風が通る通風路を形成している、The plurality of single cells form a ventilation path through which cooling air passes by being held so that the single cells are separated from each other.
ことを特徴とする組電池。A battery pack characterized by that.
請求項1乃至4のいずれかに記載の組電池において、The assembled battery according to any one of claims 1 to 4,
前記複数の接続導体は、それぞれ、前記中枠に装着された状態で、前記単電池の前記正極外部端子及び前記負極外部端子に溶接されている、The plurality of connection conductors are welded to the positive external terminal and the negative external terminal of the unit cell, respectively, in a state of being attached to the middle frame.
ことを特徴とする組電池。A battery pack characterized by that.
請求項1乃至5のいずれかに記載の組電池において、The assembled battery according to any one of claims 1 to 5,
前記嵌合部は、嵌合穴、及び前記嵌合穴に嵌合する突起によって構成されている、The fitting portion is constituted by a fitting hole and a protrusion that fits into the fitting hole.
ことを特徴とする組電池。A battery pack characterized by that.
請求項1乃至6のいずれかに記載の組電池において、The assembled battery according to any one of claims 1 to 6,
前記電圧検出配線の一方にはコネクタが設けられている、A connector is provided on one of the voltage detection wires.
ことを特徴とする組電池。A battery pack characterized by that.
請求項1乃至7のいずれかに記載の組電池を複数備えた電池モジュール。The battery module provided with two or more assembled batteries in any one of Claims 1 thru | or 7.
JP2011060718A 2011-03-18 2011-03-18 Battery pack and battery module Active JP5255083B2 (en)

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