JP2008181765A - Battery pack, and its manufacturing method - Google Patents

Battery pack, and its manufacturing method Download PDF

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JP2008181765A
JP2008181765A JP2007014355A JP2007014355A JP2008181765A JP 2008181765 A JP2008181765 A JP 2008181765A JP 2007014355 A JP2007014355 A JP 2007014355A JP 2007014355 A JP2007014355 A JP 2007014355A JP 2008181765 A JP2008181765 A JP 2008181765A
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battery pack
battery
electrode terminals
battery cell
bent
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JP5159112B2 (en
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Wataru Okada
渉 岡田
Kazunobu Yokoya
和展 横谷
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Sanyo Electric Co Ltd
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Sanyo Electric Co 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

Abstract

<P>PROBLEM TO BE SOLVED: To enable to connect neighboring battery cells mutually without using a bus bar. <P>SOLUTION: This is a battery pack in which a plurality of battery cells 10 are made adjacent, and mutually connected in series and/or in parallel. In a state that the battery cell 10 in which the positive and negative electrode terminals 12 are made protruded from one end face, the battery cell 10 and the end face at which the electrode terminals 12 are installed are arranged nearly in the same plane, and a fixing fixture FS in order to couple the mutual electrode terminals 12 of the battery cell 10 is equipped. The electrode terminals 12 are formed in a plate shape, the electrode terminals 12 are made protruded upward from the end face of the battery cell 10, and have folded back faces 12a by folding back the tips. The neighboring folded back faces 12a of the electrode terminals 12 of the battery cell 10 are mutually made contacted in a superposed state, and coupled in a fixed state by the fixing fixture FS. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、電池セルを複数直列及び/又は並列に接続した電池パック及びその製造方法に関する。   The present invention relates to a battery pack in which a plurality of battery cells are connected in series and / or in parallel, and a method for manufacturing the same.

電気自動車やハイブリッド自動車の電源として使用される電池パック(パック電池)あるいは組電池は、限られたスペースでの高出力化が求められており、円筒型電池セルの他、高密度配置が容易な角形電池が使用される。このような電池セル同士を直列又は並列に電気接続するために、バスバー等の連結部材が使用される(例えば特許文献1)。図36に示すように、バスバーBBは各電池セル10Fの電極端子12Fに各々ネジ止めされる
特開平5−343105号公報(図4)
Battery packs (packed batteries) or assembled batteries used as power sources for electric vehicles and hybrid vehicles are required to have high output in a limited space, and are easy to arrange with high density in addition to cylindrical battery cells. A square battery is used. In order to electrically connect such battery cells in series or in parallel, a connecting member such as a bus bar is used (for example, Patent Document 1). As shown in FIG. 36, the bus bar BB is screwed to the electrode terminal 12F of each battery cell 10F.
JP-A-5-343105 (FIG. 4)

しかしながら、バスバーは個別の部材であるため、連結数が多くなると使用するバスバーの数やサイズが大きくなりコストが高くなる。特に近年の大出力化の要求に応えるため、電池セルの使用数が多くなる傾向にあるため、バスバーによる連結ではバスバーのコストも無視できない。また、各電池セルの電極端子とバスバーとの連結部分で接触抵抗が生じるため、バスバーの使用数が増えると接触抵抗も増大することになる。   However, since the bus bar is an individual member, the number and size of the bus bars to be used increase and the cost increases when the number of connections increases. In particular, in order to meet the demand for higher output in recent years, the number of battery cells used tends to increase. Therefore, the cost of the bus bar cannot be ignored in connection with the bus bar. Moreover, since contact resistance arises in the connection part of the electrode terminal of each battery cell and a bus bar, when the number of use of a bus bar increases, contact resistance will also increase.

本発明は、このような問題点を解決するためになされたものである。本発明の主な目的は、バスバーを使用することなく隣接する電池セル同士を連結可能とした電池パック及びその製造方法を提供することにある。   The present invention has been made to solve such problems. A main object of the present invention is to provide a battery pack capable of connecting adjacent battery cells without using a bus bar, and a manufacturing method thereof.

課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention

上記の目的を達成するために、本発明の電池パックは、複数の電池セルを隣接させ、互いに直列及び/又は並列に接続した電池パックであって、正負の電極端子を一方の端面から突出させた複数の電池セルと、電池セルを、電極端子を設けた端面を略同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定状態に連結するための固定具と、を備え、電極端子は、板状に形成され、板状電極端子は電池セルの端面から上方に突出させ、先端を折曲して折曲面を有しており、隣接する電池セルの電極端子の折曲面同士を重ね合わせた状態に当接させて、固定具で固定状態に連結している。これにより、バスバーのような別部材を使用することなく、隣接する電池セルの電極端子同士を直接当接させて電気接続することができ、電池セルの電気接続を低コスト化できる。   In order to achieve the above object, a battery pack of the present invention is a battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel, with positive and negative electrode terminals protruding from one end face. A plurality of battery cells and a fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state in which the battery cells are arranged in a state in which the end surfaces provided with the electrode terminals are substantially aligned on the same plane The electrode terminal is formed in a plate shape, the plate electrode terminal protrudes upward from the end surface of the battery cell, has a bent curved surface by bending the tip, and the electrode of the adjacent battery cell The bent surfaces of the terminals are brought into contact with each other and are connected to each other in a fixed state by a fixing tool. Thereby, without using a separate member such as a bus bar, the electrode terminals of adjacent battery cells can be brought into direct contact with each other for electrical connection, and the electrical connection of the battery cells can be reduced in cost.

また固定具は、折曲面に開口された連結穴に挿通させる挿通体を備えており、連結穴を形成した折曲面同士を当接させた状態で、挿通体が電池セルの端面に対して略垂直な方向に貫通されるよう構成することができる。これにより、電池パックの上面から連結作業を行うことができ、作業性に優れるという利点が得られる。   In addition, the fixing device includes an insertion body that is inserted into the connection hole that is opened in the folding surface, and the insertion body is substantially in contact with the end surface of the battery cell in a state in which the folding surfaces that form the connection holes are in contact with each other. It can be configured to penetrate in a vertical direction. Thereby, a connection operation can be performed from the upper surface of the battery pack, and an advantage of excellent workability can be obtained.

なお固定具は、挿通体が電池セルの端面に対して略平行な方向に貫通されるよう構成してもよい。   In addition, you may comprise a fixing tool so that an insertion body may penetrate in the direction substantially parallel with respect to the end surface of a battery cell.

一方電池セルを角形電池とし、電極端子が電池セルの端面から斜め方向に突出するよう折曲され、かつ折曲面が電池セルの端面に対して略垂直な姿勢に折曲されると共に、角形電池セルの側面と略同一平面に位置することもできる。これにより、隣接する電池セル同士の電極端子自体を折曲させて折曲面同士を当接でき、接続を容易にできる。   On the other hand, the battery cell is a square battery, the electrode terminal is bent so as to protrude obliquely from the end face of the battery cell, and the bent curved face is bent in a posture substantially perpendicular to the end face of the battery cell. It can also be located in substantially the same plane as the side of the cell. As a result, the electrode terminals themselves of adjacent battery cells can be bent so that the bent surfaces can come into contact with each other, and the connection can be facilitated.

また電池セルの端面から電極端子を一対、離間されて突出させ、各電極端子が相互に異なる方向に斜め方向に突出するよう構成してもよい。これにより、隣接する電池セル同士の直列接続を容易に行える。   Further, a pair of electrode terminals may be protruded from the end face of the battery cell so as to be spaced apart from each other, and each electrode terminal may protrude obliquely in different directions. Thereby, the serial connection of adjacent battery cells can be performed easily.

さらに連結穴は長孔としてもよい。連結穴を長穴にすることで、電極端子部分で組付け公差を吸収でき、溶接により完全に固定してしまう場合に比べ、端子部分への負荷を軽減することができる。   Further, the connecting hole may be a long hole. By making the connecting hole an elongated hole, the assembly tolerance can be absorbed by the electrode terminal portion, and the load on the terminal portion can be reduced as compared with the case where it is completely fixed by welding.

あるいは、連結穴に代えて、折曲面に切り欠き形状を形成してもよい。これにより、連結穴に比べ切り欠きの形成が容易で、また取り付け作業も容易となる。   Or it may replace with a connection hole and may form a notch shape in a folding surface. Thereby, it is easier to form a notch than the connecting hole, and the mounting operation is also easy.

一方で電池セルを角形電池とし、電極端子は電池セルの端面から略垂直方向に突出され、かつ先端を端面と平行になるように断面略L字状に折曲して水平折曲面としてなり、隣接する電池セル同士で水平折曲面を重ねて固定具で連結するよう構成することもできる。これにより、隣接する電池セル同士で、水平折曲面を重ねて固定具で連結でき、バスバー等の別部材を不要にできる。   On the other hand, the battery cell is a square battery, the electrode terminal protrudes from the end surface of the battery cell in a substantially vertical direction, and the tip is bent into a substantially L-shaped cross-section so as to be parallel to the end surface, thereby forming a horizontal folding surface It can also comprise so that adjacent battery cells may overlap with a horizontal folding surface and it may connect with a fixing tool. Thereby, between adjacent battery cells, a horizontal folding surface can be piled up and connected with a fixture, and another member such as a bus bar can be dispensed with.

また一対の電極端子の水平折曲面を重ねて固定具で連結する部分において、上側に重ねる水平折曲面の折り曲げ角度が90°以下であり、下側に重ねる水平折曲面の折り曲げ角度が90°以上であり、両者の和が略180°であるよう設定してもよい。これにより、上側と下側の水平折曲面の角度を対応させて一対の電極端子を重ね合わせることができる。   In addition, in the portion where the horizontal folding surfaces of the pair of electrode terminals are overlapped and connected by the fixture, the bending angle of the horizontal folding surface that is superimposed on the upper side is 90 ° or less, and the bending angle of the horizontal folding surface that is superimposed on the lower side is 90 ° or more And the sum of the two may be set to approximately 180 °. Thereby, a pair of electrode terminal can be overlap | superposed by making the angle of the horizontal folding surface of an upper side and a lower side correspond.

また一対の電極端子は、一方の折曲方向が他方の折曲方向と逆向きに折曲されてなるよう構成できる。これにより、電池セルの両面で隣接する電池セルと各々電極端子を接続でき、直列接続が容易に実現できる。   Moreover, a pair of electrode terminal can be comprised so that one bending direction may be bent in the opposite direction to the other bending direction. Thereby, the battery cell which adjoins on both surfaces of a battery cell and each electrode terminal can be connected, and series connection can be implement | achieved easily.

さらに一対の電極端子の一方の折曲位置が、他方の折曲位置よりも電極端子の厚さに相当する分だけ低くして折曲することもできる。これにより、隣接する電池セル同士の連結に際して、電極端子の厚さ分だけオフセット配置された折曲面を重ね合わせることが容易となり、電池セルの配列を正確に行える。   Furthermore, the bending position of one of the pair of electrode terminals can be bent by being lower than the other bending position by an amount corresponding to the thickness of the electrode terminal. Accordingly, when connecting adjacent battery cells, it becomes easy to superimpose the folded curved surfaces offset by the thickness of the electrode terminals, and the battery cells can be arranged accurately.

ここで固定具は、リベットが利用できる。これにより、ボルトのように緩みが生じることも無く、接続部の信頼性を向上できる。   Here, a rivet can be used as the fixture. Thereby, the looseness does not occur like a bolt, and the reliability of the connecting portion can be improved.

特に固定具は、ブラインドリベットを利用してもよい。これにより、片側から連結作業を行えるので、作業を容易にできる。   In particular, the fixture may use blind rivets. Thereby, since the connection work can be performed from one side, the work can be facilitated.

あるいは固定具に、ボルト及びナットを利用することもできる。   Or a bolt and a nut can also be utilized for a fixture.

ここで電池セルの端面から突出させた電極端子の金属が正極と負極で異なっており、隣接する電池セルの折曲面を重ね合わせる際、強度の強い電極端子を下側に位置させて固定具であるブラインドリベットで上側から固定するよう構成することもできる。これにより、ブラインドリベットで連結する際のシャフトの潜り込みを防止できる。   Here, the metal of the electrode terminal protruding from the end surface of the battery cell is different between the positive electrode and the negative electrode, and when overlapping the folded surfaces of adjacent battery cells, the strong electrode terminal is positioned on the lower side with a fixture. It can also be configured to be fixed from above with a certain blind rivet. Thereby, it is possible to prevent the shaft from entering when connecting with the blind rivet.

また固定具に、電極端子との当接面に弾性部材を介在させることもできる。これにより、弾性部材で連結面の押圧して摩擦力を高め、緩み止め効果が得られる。   In addition, an elastic member can be interposed between the fixture and the contact surface with the electrode terminal. As a result, the connecting surface is pressed by the elastic member to increase the frictional force, and a loosening prevention effect is obtained.

この弾性部材には、スプリングワッシャが利用できる。これにより、安価に固定具の緩み止めを行うことができる。   A spring washer can be used for this elastic member. As a result, the fixing device can be prevented from loosening at low cost.

一方で、電池セルの電圧を測定するために電池セルの電極端子と電気的に接続される電圧検出用端子を備えており、電圧検出用端子は、折曲面に開口された連結穴と略等しいかこれよりも大きい内径に検出端子穴を開口させており、固定具が、隣接する電池セルの電極端子同士を連結する際に、電圧検出用の端子を共締めする構成も採用できる。これにより、電池セル同士の連結と電圧検出用の端子の接続を同時に行うことができ、部品点数の削減及び作業性の向上が図られる。   On the other hand, in order to measure the voltage of the battery cell, a voltage detection terminal electrically connected to the electrode terminal of the battery cell is provided, and the voltage detection terminal is substantially equal to the connecting hole opened in the folding surface. Alternatively, it is possible to employ a configuration in which a detection terminal hole is opened at an inner diameter larger than this, and the voltage detection terminal is fastened together when the fixture connects the electrode terminals of adjacent battery cells. Thereby, the connection of battery cells and the connection of the terminal for voltage detection can be performed simultaneously, and reduction of a number of parts and improvement of workability | operativity are achieved.

ここで電圧検出用端子が、弾性部材を有しており、弾性部材を固定具と電極端子との間に介在させるよう連結してもよい。これにより、電圧検出用端子に弾性部材としての機能を持たせて、固定具と電極端子との間に介在させることで緩み止め防止を発揮でき、さらに作業性を向上できる。   Here, the voltage detection terminal may have an elastic member, and the elastic member may be connected to be interposed between the fixture and the electrode terminal. As a result, the voltage detection terminal can be provided with a function as an elastic member and interposed between the fixture and the electrode terminal to prevent loosening and further improve workability.

さらに折曲面に、連結穴を2以上開口し、各連結穴に固定具を貫通させて固定することもできる。これにより、固定具を二重又は三重以上にして電極端子の締結力をさらに増し、信頼性を向上させることができる。   Furthermore, two or more connecting holes can be opened in the folding surface, and a fixing tool can be passed through each connecting hole and fixed. As a result, the fixture can be doubled or tripled or more to further increase the fastening force of the electrode terminals and improve the reliability.

また一の連結穴に、弾性部材を配置して固定具と折曲面との間に挟み込み、他の連結穴に、電圧検出用端子を配置して固定具と折曲面との間に挟み込むこともできる。これにより、固定具を二重又は三重以上にして締結力を増すことに加え、一方に弾性部材を、他方に電圧検出用端子を配置して効率よくこれらを連結できる。   Also, an elastic member may be placed in one connecting hole and sandwiched between the fixture and the folded curved surface, and a voltage detection terminal may be placed in the other coupling hole and sandwiched between the fixture and the folded curved surface. it can. Thereby, in addition to increasing the fastening force by making the fixture double or triple, it is possible to efficiently connect the elastic member on one side and the voltage detection terminal on the other side.

一方で、他の電池パックとして、隣接する電池セルの電極端子の折曲面同士を重ね合わせた折曲面の連結穴に一方からボルトを挿通して他方をナットに螺合させて固定するよう構成することもできる。これにより、ボルトとナットの螺合により確実に電池セルを電気接続できる。   On the other hand, as another battery pack, it is configured such that a bolt is inserted from one side into a folding surface connecting hole where folding surfaces of electrode terminals of adjacent battery cells are overlapped, and the other is screwed into a nut and fixed. You can also. Thereby, a battery cell can be reliably electrically connected by screwing of a volt | bolt and a nut.

また、固定具が、ボルトと、一方の折曲面の連結穴にバーリング加工してネジ溝を形成したバーリング部を含み、隣接する電池セルの電極端子の折曲面同士を、バーリング部を有する折曲面が下方に位置するように重ね合わせ、連結穴の上方からボルトを挿通して、バーリング部のネジ溝に螺合させて固定することもできる。これにより、別途ナットを用意することなく螺合により確実に電池セルを電気接続できる。   Further, the fixture includes a bolt and a burring portion in which a screw groove is formed by burring a connection hole of one folding surface, and the folding surfaces of electrode terminals of adjacent battery cells are folded surfaces having a burring portion. Can be positioned so as to be positioned below, and a bolt can be inserted from above the connecting hole and screwed into the thread groove of the burring portion to be fixed. Accordingly, the battery cells can be reliably electrically connected by screwing without separately preparing a nut.

さらに固定具が、ボルトと、一方の折曲面の連結穴に開口を一致させるようナットを固定したナット部を含み、隣接する電池セルの電極端子の折曲面同士を、ナット部を有する折曲面が下方に位置するように重ね合わせ、連結穴の上方からボルトを挿通して、ナット部に螺合させて固定することもできる。これにより、別途ナットを用意することなく螺合により確実に電池セルを電気接続できる。   Further, the fixture includes a bolt and a nut portion that fixes a nut so that the opening is aligned with the connection hole of one folding surface, and the folding surface of the electrode terminals of adjacent battery cells has a folding surface. They can be overlapped so as to be positioned below, a bolt can be inserted from above the connecting hole, and screwed into the nut portion to be fixed. Accordingly, the battery cells can be reliably electrically connected by screwing without separately preparing a nut.

さらに一方で、複数の電池セルを隣接させ、互いに直列及び/又は並列に接続した電池パックであって、正負の電極端子を一方の端面から突出させた複数の電池セルと、電池セルを、電極端子を設けた端面を略同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定状態に連結するための固定具とを備え、電極端子は、板状に形成され、板状電極端子は電池セルの端面から上方に突出させ、先端を、断面略L字状に折曲して折曲面を有し、折曲面には連結穴が開口されており、固定具が、連結穴に挿通されるボルトと、ボルトに螺合するナットであって、複数の電池セルを重ね合わせた状態で各電池セルの折曲面の位置に合致させるように、ナットを一定間隔で離間させて所定の姿勢に保持する絶縁性部材で構成され、絶縁性部材の一面から一定間隔でナットを設けたナット突出部が突出されており、ナット突出部は、断面略L字状に折曲された電極端子の、折曲面の下面に挿入できる大きさに形成されてなり、複数の電池セルを重ね合わせて各折曲面を当接させ、連結穴を一致させるよう位置決めした状態で、電池パックの側面から絶縁性部材を、ナット突出部が各々折曲面の下面に挿入するように配置し、この状態でボルトを各々の連結穴に挿入し、ナット突出部のナットと螺合して連結するよう構成した電池パックとすることもできる。これにより、ナットを各連結穴に位置決めする作業を一括して行うことができ、作業性を向上できる。   On the other hand, a battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other, the plurality of battery cells with positive and negative electrode terminals protruding from one end surface, and the battery cell, A fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state where the end surfaces provided with the terminals are arranged in a substantially uniform plane, and the electrode terminals are formed in a plate shape The plate-like electrode terminal protrudes upward from the end surface of the battery cell, the tip is bent into a substantially L-shaped cross section, has a curved surface, and the connection surface is opened in the folded surface. Are bolts inserted into the connection holes and nuts screwed into the bolts, and the nuts are arranged at regular intervals so as to match the positions of the folding surfaces of the battery cells in a state where a plurality of battery cells are overlapped. Consists of insulating members that are spaced apart and held in a predetermined position In addition, a nut protruding portion provided with nuts at regular intervals protrudes from one surface of the insulating member, and the nut protruding portion can be inserted into the lower surface of the folded curved surface of the electrode terminal bent in a substantially L-shaped cross section. In a state where a plurality of battery cells are overlapped, the folded curved surfaces are brought into contact with each other, and the connecting holes are positioned so that the connecting holes are aligned, the insulating member is inserted from the side surface of the battery pack, The battery pack may be arranged so as to be inserted into the lower surface of the folded curved surface, and in this state, the bolt is inserted into each connection hole and screwed into and connected to the nut of the nut protruding portion. Thereby, the operation | work which positions a nut to each connection hole can be performed collectively, and workability | operativity can be improved.

一方で、複数の電池セルを隣接させ、互いに直列及び/又は並列に接続した電池パックの製造方法は、電池セルの端面から上方に突出させた板状の電極端子の先端に連結穴を開口させておき、該先端を折曲して折曲面を形成する工程と、電池セルを、電極端子を設けた端面を略同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定具を用いて固定状態に連結する工程とを含むことができる。これにより、バスバーのような別部材を使用することなく、隣接する電池セルの電極端子同士を直接当接させて電気接続することができ、電池セルの電気接続を低コスト化できる。また固定までの一連の生産工程を自動化又は半自動化することができ、電池パックの生産を効率化することができる。   On the other hand, in a method of manufacturing a battery pack in which a plurality of battery cells are adjacent to each other and connected in series and / or in parallel, a connection hole is opened at the tip of a plate-like electrode terminal protruding upward from the end face of the battery cell. In addition, the step of bending the tip to form a bent surface, and the battery cell electrode terminals of adjacent battery cells arranged in a state where the end surfaces provided with the electrode terminals are aligned on substantially the same plane And connecting them to each other in a fixed state using a fixture. Thereby, without using a separate member such as a bus bar, the electrode terminals of adjacent battery cells can be brought into direct contact with each other for electrical connection, and the electrical connection of the battery cells can be reduced in cost. In addition, a series of production steps up to fixing can be automated or semi-automated, and the production of the battery pack can be made efficient.

以下、本発明の実施の形態を図面に基づいて説明する。ただし、以下に示す実施の形態は、本発明の技術思想を具体化するための電池パック及びその製造方法を例示するものであって、本発明は電池パック及びその製造方法を以下のものに特定しない。また特許請求の範囲に示される部材を、実施の形態の部材に特定するものでは決してない。なお、各図面が示す部材の大きさや位置関係等は、説明を明確にするため誇張していることがある。さらに以下の説明において、同一の名称、符号については同一もしくは同質の部材を示しており、詳細説明を適宜省略する。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。
(実施の形態1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery pack and its manufacturing method for embodying the technical idea of the present invention, and the present invention specifies the battery pack and its manufacturing method as follows. do not do. Moreover, the member shown by the claim is not what specifies the member of embodiment. In addition, the size, positional relationship, and the like of members illustrated in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and reference numeral indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
(Embodiment 1)

図1に、本発明の実施の形態1に係る電池パック100の外観斜視図を、図2に側面図を、図3にこの電池パック100の固定具FSの分解斜視図を、図4に電池パック100を構成する電池セル10の斜視図を、図5に電池セル10の正面図を、図6に電池セル10の側面図を、それぞれ示す。これらの図に示す電池パック100は、車載用の電池パックであって、複数の電池セル10とセパレータ20を交互に積層し、左右端面をエンドプレート30で被覆して構成される。具体的には、角形の電池セル10を枠状のセパレータ20で狭持し、電池セル10の上面及び側面を露出させた状態で多段に積層する。
(電池セル10)
FIG. 1 is an external perspective view of battery pack 100 according to Embodiment 1 of the present invention, FIG. 2 is a side view, FIG. 3 is an exploded perspective view of fixture FS of battery pack 100, and FIG. A perspective view of the battery cell 10 constituting the pack 100 is shown, FIG. 5 is a front view of the battery cell 10, and FIG. 6 is a side view of the battery cell 10. The battery pack 100 shown in these drawings is an in-vehicle battery pack, in which a plurality of battery cells 10 and separators 20 are alternately stacked, and left and right end surfaces are covered with an end plate 30. Specifically, the rectangular battery cells 10 are sandwiched between frame-shaped separators 20 and stacked in multiple stages with the upper and side surfaces of the battery cells 10 exposed.
(Battery cell 10)

電池セル10は、角形の外装缶に被覆された略矩形の角形電池が利用される。角形電池セルは円筒型電池と比較して効率よく配置でき、単位体積当たりのエネルギー密度を高くできる。特に車載用途では省スペース化の要求が高く、好ましい。このような電池セルには、リチウムイオン二次電池等、角形の二次電池が利用できる。またニッケル電池等の他、一次電池としてもよい。電池セル10の電極端子12は、直列又は並列に結線される。さらに電池パック100の端部で制御回路(図示せず)に接続され、制御回路によって各電池セル10の電圧、電流、温度等を測定し、電池容量及び必要充放電量等を決定して、充放電等の制御が行われる。   As the battery cell 10, a substantially rectangular prismatic battery covered with a prismatic outer can is used. Square battery cells can be arranged more efficiently than cylindrical batteries, and can increase the energy density per unit volume. Especially for in-vehicle applications, there is a high demand for space saving, which is preferable. For such a battery cell, a rectangular secondary battery such as a lithium ion secondary battery can be used. Moreover, it is good also as a primary battery other than a nickel battery. The electrode terminals 12 of the battery cells 10 are connected in series or in parallel. Furthermore, it is connected to a control circuit (not shown) at the end of the battery pack 100, and the voltage, current, temperature, etc. of each battery cell 10 is measured by the control circuit, and the battery capacity and required charge / discharge amount are determined. Control such as charging and discharging is performed.

電池セル10は図4の斜視図に示すように、側面を面取りした角形の外装缶の上面から、正負の電極端子12を突出させている。電極端子12を突出させる位置は、正極と負極が外装缶の主面で、左右対称となる位置に設定される。これにより、電池セル10を裏返して重ねると、正極と負極とを重ね合わせることができ、直列接続を容易に行える。電極端子12はそれぞれ断面L字状に折曲され、さらに折曲した片(折曲面12a)には連結穴13を開口している。特に図6に示すように正負の電極端子12は互いに逆方向に折曲されており、隣接する電池セル10との間で電極端子12を直接接続可能な大きさ及び形状に形成される。これにより、隣接する電池セル10間で正極と負極を直接接続して、電池セル10を直列或いは並列に接続することが容易となる。またこの電池セル10は図5に示すように、電極端子12の周囲を囲むように直立された端子リブ14が形成されており、これにより外装缶内部の電解液が電極端子12の周囲から漏洩しても、不用意に拡散する事態が阻止される。
(セパレータ20)
As shown in the perspective view of FIG. 4, the battery cell 10 has positive and negative electrode terminals 12 protruding from the upper surface of a rectangular outer can whose sides are chamfered. The position where the electrode terminal 12 protrudes is set to a position where the positive electrode and the negative electrode are symmetrical on the main surface of the outer can. Thereby, when the battery cell 10 is turned over and overlapped, the positive electrode and the negative electrode can be overlapped, and series connection can be easily performed. Each of the electrode terminals 12 is bent into an L-shaped cross section, and a connecting hole 13 is opened in the further bent piece (folded curved surface 12a). In particular, as shown in FIG. 6, the positive and negative electrode terminals 12 are bent in opposite directions, and are formed in such a size and shape that the electrode terminals 12 can be directly connected to adjacent battery cells 10. Thereby, it becomes easy to connect the positive electrode and the negative electrode directly between adjacent battery cells 10 and connect the battery cells 10 in series or in parallel. As shown in FIG. 5, the battery cell 10 is formed with terminal ribs 14 standing upright so as to surround the periphery of the electrode terminal 12, so that the electrolyte in the outer can can leak from the periphery of the electrode terminal 12. Even so, the situation of inadvertent spreading is prevented.
(Separator 20)

電池セル10は、図1に示すようにその両面からセパレータ20で挟み込むようにして外部を被覆される。セパレータ20は、電池セル10を被覆する大きさの枠体状に構成され、電池セル10を被覆した状態で電池セル10の両側面及び上下端面を露出させ、四隅部を被覆する。また隣接するセパレータ20との間で、隅部同士を当接させて積層される。セパレータ20は耐熱性、断熱性に優れた部材で構成され、好ましくは軽量で安価な樹脂により形成される。例えば熱伝導率の小さい(望ましくは0.5W/m以下)、ポリプロピレン、ポリウレタン等の合成樹脂が利用できる。これにより、セパレータ20で電池セル10を保護すると共に、隣接する電池セル10同士を絶縁し断熱する。またセパレータ20の底面は断面を凹凸状としたスリットが形成され、このスリットを経路として冷却媒体を通すことにより、電池セル10を側面から冷却する。
(エンドプレート30)
As shown in FIG. 1, the battery cell 10 is coated on the outside so as to be sandwiched by separators 20 from both sides. The separator 20 is configured in a frame shape having a size covering the battery cell 10, and exposes both side surfaces and upper and lower end surfaces of the battery cell 10 in a state of covering the battery cell 10, and covers the four corners. Further, the adjacent separators 20 are stacked with the corners in contact with each other. The separator 20 is composed of a member having excellent heat resistance and heat insulation, and is preferably formed of a lightweight and inexpensive resin. For example, a synthetic resin such as polypropylene or polyurethane having a low thermal conductivity (preferably 0.5 W / m or less) can be used. Thereby, while protecting the battery cell 10 with the separator 20, the adjacent battery cells 10 are insulated and insulated. In addition, a slit having a concavo-convex cross section is formed on the bottom surface of the separator 20, and the battery cell 10 is cooled from the side by passing a cooling medium through the slit.
(End plate 30)

以上のようにしてセパレータ20と電池セル10を交互に重ねるようにして連結された状態で、端面をエンドプレート30で被覆して固定する。エンドプレート30は、端面で露出する電池セル10を被覆できる大きさに形成され、両側からこれを狭持する状態に固定する。この例では、エンドプレート30の側面に一対のネジ穴32を突出させ、電池セル10を積層した電池パック100側面に延長した延長ボルト34を通してエンドプレート30同士を螺合により固定している。エンドプレート30も好ましくは一体成形により成形可能な、金属製や樹脂製のものが使用できる。
(電極端子12)
In the state where the separators 20 and the battery cells 10 are alternately connected to each other as described above, the end surfaces are covered with the end plate 30 and fixed. The end plate 30 is formed in a size that can cover the battery cell 10 exposed at the end face, and is fixed to be sandwiched from both sides. In this example, a pair of screw holes 32 are protruded from the side surface of the end plate 30, and the end plates 30 are fixed by screwing through extension bolts 34 extended to the side surface of the battery pack 100 on which the battery cells 10 are stacked. The end plate 30 is preferably made of metal or resin, which can be molded by integral molding.
(Electrode terminal 12)

電極端子12は、図5及び図6に示すように、正極及び負極を相互に逆向きに断面L字状に折曲すると共に、折曲させる位置を、正極及び負極で電極端子12の厚さに相当する分だけオフセットさせている。これにより、図3に示すように電池セル10を積層する際に、電池セル10の端面をほぼ同一平面に維持したまま、隣り合う電池セル10の折曲面12aを重ね合わせることができる。   As shown in FIGS. 5 and 6, the electrode terminal 12 bends the positive electrode and the negative electrode in a cross-sectional L shape in opposite directions, and the position where the electrode terminal 12 is bent is the thickness of the electrode terminal 12 between the positive electrode and the negative electrode. Is offset by the amount corresponding to. Thereby, when the battery cells 10 are stacked as shown in FIG. 3, the folding surfaces 12 a of the adjacent battery cells 10 can be overlapped while the end surfaces of the battery cells 10 are maintained substantially on the same plane.

このようにして重ね合わされた電極端子12は、固定具FSを用いて固定される。隣接する電池セル10の折曲面12aを重ね合わせる際、各々の折曲面12aに開口された連結穴13を少なくとも部分的に一致させ、ここに固定具FSの挿通体を挿入する。この際、重ね合わせる折曲面12aの内、上側の折曲面12aの連結穴13の内径を大きくすることで、寸法公差を吸収し位置合わせを容易にできる。   The electrode terminals 12 superposed in this way are fixed using a fixing tool FS. When the folding surfaces 12a of the adjacent battery cells 10 are overlapped, the connecting holes 13 opened in the respective folding surfaces 12a are at least partially matched, and an insertion body for the fixture FS is inserted therein. At this time, by increasing the inner diameter of the connecting hole 13 of the upper folded curved surface 12a among the folded curved surfaces 12a to be superimposed, the dimensional tolerance can be absorbed and alignment can be facilitated.

また連結穴13は円形に限られず、長孔としてもよい。これにより、位置合わせの微調整が一層容易になり、溶接により完全に固定してしまう場合に比べ、端子部分への負荷を軽減できる。あるいは、連結穴は貫通穴に限られず、切り欠き状としてもよい。これにより、切り欠き状の形成や取り付け作業を容易にできる。
(ブラインドリベット51)
The connecting hole 13 is not limited to a circular shape, and may be a long hole. As a result, fine adjustment of the alignment is further facilitated, and the load on the terminal portion can be reduced as compared with the case where the position is completely fixed by welding. Or a connection hole is not restricted to a through-hole, It is good also as a notch shape. Thereby, formation of notch shape and attachment work can be facilitated.
(Blind rivet 51)

図3の例では、固定具FSとしてリベットを使用している。リベットは、金属の塑性変形を利用して締結を行う。図7に、リベットで固定した電極端子12の折曲面12aの断面図を示す。リベットによる固定は、螺合のような回転が不要で緩みの心配もなく、信頼性に優れる。またリベットは、通常のリベットに限られず、好ましくはブラインドリベットが使用される。ブラインドリベットは、折曲面の片側から締結できる特殊なリベットである。図3に、ブラインドリベット51の外観を示す。ブラインドリベット51は、フランジと、フランジに挿通されるシャフト(マンドレル)とを備え、このシャフトを引き上げることで、リベットの頭を団子状に潰して、図7のような状態とできる。この方法であれば、大がかりな設備が不要で、また折曲面12aの下側の受けも不要にでき、極めて簡単に折曲面12aを締結できる。   In the example of FIG. 3, a rivet is used as the fixture FS. The rivet is fastened using plastic deformation of metal. FIG. 7 shows a cross-sectional view of the bent surface 12a of the electrode terminal 12 fixed with rivets. Fixing with rivets is superior in reliability because there is no need for rotation such as screwing, no worry about loosening. The rivet is not limited to a normal rivet, and a blind rivet is preferably used. A blind rivet is a special rivet that can be fastened from one side of a folding surface. FIG. 3 shows the appearance of the blind rivet 51. The blind rivet 51 includes a flange and a shaft (mandrel) inserted through the flange. By pulling up the shaft, the head of the rivet is crushed into a dumpling shape, and the state shown in FIG. 7 can be obtained. This method eliminates the need for large-scale equipment, and eliminates the need for receiving the lower side of the folding surface 12a, so that the folding surface 12a can be fastened very easily.

また、電池セルは電極端子12を構成する金属に、正極と負極で異なる材質を使用することがある。この場合、リベット等の固定具FSの締結態様に応じて、重ね合わせる折曲面12aの上下の強度を選択する。例えば、ブラインドリベット51を使用する際は、下側に位置する折曲面12aが、上側よりも強度の高い電極端子12となるように、折曲位置を設定する。これにより、ブラインドリベット51で連結する際、シャフトの潜り込みを防止できる。例えば正極端子にAl、負極端子にCuを使用するリチウムイオン電池の場合、強度の高い負極端子の折曲面12aが下側となるように、負極端子側の折曲位置が正極側よりも電極端子12の厚さ分だけ電池セル端面からの距離が短くなるように(高さが低くなるように)調整する。
(弾性部材60)
The battery cell may use different materials for the metal constituting the electrode terminal 12 for the positive electrode and the negative electrode. In this case, the strength above and below the folded curved surface 12a is selected according to the fastening mode of the fixing tool FS such as a rivet. For example, when the blind rivet 51 is used, the bending position is set so that the bent curved surface 12a located on the lower side becomes the electrode terminal 12 having higher strength than the upper side. Thereby, when connecting with the blind rivet 51, it is possible to prevent the shaft from entering. For example, in the case of a lithium ion battery using Al for the positive electrode terminal and Cu for the negative electrode terminal, the bending position on the negative electrode terminal side is higher than the positive electrode side so that the bent surface 12a of the negative electrode terminal having high strength is on the lower side. Adjustment is made so that the distance from the end face of the battery cell is shortened by the thickness of 12 (so that the height is lowered).
(Elastic member 60)

また、固定具FSの緩み止めのため、弾性部材60を介在させることもできる。固定具FSと折曲面12aとの間に弾性部材60を介在させることで、弾性部材60で連結面の押圧して摩擦力を高め、緩み止め効果が得られる。図8〜図11に、弾性部材60としてスプリングワッシャを用いる例を説明する。これらの図において、図8は弾性部材60を備える固定具FSを示す分解斜視図、図9は図8の電池パック200の分解側面図、図10はスプリングワッシャで固定する状態を示す分解斜視図、図11はスプリングワッシャで固定した状態を示す斜視図を、それぞれ示している。図10に示すように、スプリングワッシャを介してブラインドリベット51を折曲面12aの連結穴13に挿通させることで、図11に示すように簡単に弾性部材60を介在でき、安価に固定具FSの緩み止めを図ることができる。
(電圧検出用端子70)
In addition, an elastic member 60 can be interposed to prevent the fixture FS from loosening. By interposing the elastic member 60 between the fixture FS and the folded curved surface 12a, the elastic member 60 presses the connecting surface to increase the frictional force, and a loosening prevention effect is obtained. An example in which a spring washer is used as the elastic member 60 will be described with reference to FIGS. In these drawings, FIG. 8 is an exploded perspective view showing a fixture FS provided with an elastic member 60, FIG. 9 is an exploded side view of the battery pack 200 of FIG. 8, and FIG. 10 is an exploded perspective view showing a state of being fixed by a spring washer. FIG. 11 is a perspective view showing a state of being fixed by a spring washer. As shown in FIG. 10, by inserting the blind rivet 51 through the connecting hole 13 of the folding surface 12a through a spring washer, the elastic member 60 can be easily interposed as shown in FIG. It is possible to prevent loosening.
(Voltage detection terminal 70)

また、複数の電池セルを直列に接続する際の中間電圧を検出するため、電圧検出用端子70を電池セルに接続することがある。この場合に、電圧検出用端子70と電極端子12との接続を、折曲面12aの接続と共通にすることで、接続工程を省力化することができる。この例を、図12〜図14に基づいて説明する。これらの図において、図12は各電池セルの中間電圧を検出する電圧検出用端子70を接続した電池パック300の斜視図、図13は図12の電圧検出用端子70の連結部分の拡大図、図14は図12の電池パック300の側面図を、それぞれ示している。電圧検出用端子70は、図13等に示すように、固定具FSの挿通体(この例ではリベット)を挿通できる検出端子穴71を形成している。検出端子穴71は折曲面12aに開口された連結穴13とほぼ等しいかこれよりも大きい内径とする。これにより、リベットを折曲面12aの連結穴13に挿通する際に検出端子穴71も併せて挿通させて共締めでき、電圧検出用端子70の連結作業を電極端子同士の連結作業と同時に行うことができるので、組み立て作業の省力化が図られる。例えば、電池セルにリチウムイオン電池を使用する場合は電池セルの中間電圧を測定する必要があり、このような場合は各電池セル毎に電圧検出用端子70を接続する必要があるため、このような作業性の向上はきわめて有効である。また、必要に応じてスプリングワッシャ等の弾性部材60を介在させることも可能であることは、いうまでもない。   Moreover, in order to detect an intermediate voltage when a plurality of battery cells are connected in series, the voltage detection terminal 70 may be connected to the battery cell. In this case, the connection process can be saved by making the connection between the voltage detection terminal 70 and the electrode terminal 12 common with the connection of the folding surface 12a. This example will be described with reference to FIGS. In these drawings, FIG. 12 is a perspective view of a battery pack 300 to which a voltage detection terminal 70 for detecting an intermediate voltage of each battery cell is connected, and FIG. 13 is an enlarged view of a connecting portion of the voltage detection terminal 70 in FIG. FIG. 14 shows a side view of the battery pack 300 of FIG. As shown in FIG. 13 and the like, the voltage detection terminal 70 has a detection terminal hole 71 into which the insertion body (the rivet in this example) of the fixture FS can be inserted. The detection terminal hole 71 has an inner diameter substantially equal to or larger than the connection hole 13 opened in the folding surface 12a. Accordingly, when the rivet is inserted into the connecting hole 13 of the bent surface 12a, the detection terminal hole 71 can be inserted together and fastened together, and the connecting operation of the voltage detecting terminal 70 is performed simultaneously with the connecting operation of the electrode terminals. Therefore, labor saving of assembly work is achieved. For example, when a lithium ion battery is used for the battery cell, it is necessary to measure the intermediate voltage of the battery cell. In such a case, it is necessary to connect the voltage detection terminal 70 for each battery cell. Such an improvement in workability is extremely effective. Needless to say, an elastic member 60 such as a spring washer may be interposed as required.

また、電圧検出用端子に、上述した緩み止めのための弾性部材の機能を持たせることもできる。この例を、図15〜図18に基づいて説明する。これらの図において、図15は、このような弾性部材60Bを備える電圧検出用端子70Bの連結部分を示す分解斜視図、図16は図15の側面図、図17は電圧検出用端子70Bと固定具FSを示す拡大分解斜視図、図18は電圧検出用端子70Bを固定した状態での拡大斜視図を、それぞれ示している。この例では、電圧検出用端子70Bの検出端子穴71を設けた部分をスプリングワッシャ状に形成しており、スプリングワッシャと同様の機能を果たすことができる。スプリングワッシャ状は、電圧検出用端子70Bと一体に形成できる。これにより、部品点数を少なくしてコストを低減すると共に、組み立て時においてもスプリングワッシャを挿通する手間を省き作業を簡略化できる。   In addition, the voltage detecting terminal can have the function of the elastic member for preventing the above-described loosening. This example will be described with reference to FIGS. In these drawings, FIG. 15 is an exploded perspective view showing a connecting portion of a voltage detection terminal 70B having such an elastic member 60B, FIG. 16 is a side view of FIG. 15, and FIG. 17 is fixed to the voltage detection terminal 70B. 18 is an enlarged exploded perspective view showing the tool FS, and FIG. 18 is an enlarged perspective view in a state where the voltage detection terminal 70B is fixed. In this example, the portion provided with the detection terminal hole 71 of the voltage detection terminal 70B is formed in a spring washer shape, and the same function as the spring washer can be achieved. The spring washer shape can be formed integrally with the voltage detection terminal 70B. As a result, the number of parts can be reduced to reduce the cost, and the work for inserting the spring washer can be omitted even during assembly, thereby simplifying the work.

なお上記の例では、折曲面に一だけ連結穴を形成した例を説明したが、連結穴を2以上開口させることもできる。これにより、固定具FSによる締結構造を二重又は三重以上にして電極端子の締結力をさらに増し、信頼性を向上させることができる。図19〜図22に、このような電池パック400の例を示す。これらの図において、図19は電池パック400の斜視図、図20は図19の側面図、図21は固定具FSによる連結部分を示す拡大分解斜視図、図22は締結状態を示す拡大斜視図を、それぞれ示している。これらの図に示す固定具FSの例では、電極端子12Bを平面図がL字状となるように形成して、折曲面12bを電池セル端面の長手方向に延長しており、ここに連結穴13、13Bを2つ開口している。また、図21に示すように一方の連結穴13には固定具FSとしてブラインドリベット51を、弾性部材60としてスプリングワッシャを介在させて挿通しており、他方の連結穴13Bには同じくブラインドリベット51を、弾性部材60Bとしてスプリングワッシャ状を一体化した電圧検出用端子70Bの検出端子穴71に挿通させて共締め状態に締結している。このように締結構造を二重にして信頼性を増すと共に、一方に電圧検出用端子70Bを配置することで中間電圧検出も併せて行うことができる。   In the above example, only one connecting hole is formed on the bent surface, but two or more connecting holes can be opened. Thereby, the fastening structure by the fixture FS can be doubled or tripled to further increase the fastening force of the electrode terminal and improve the reliability. An example of such a battery pack 400 is shown in FIGS. In these drawings, FIG. 19 is a perspective view of the battery pack 400, FIG. 20 is a side view of FIG. 19, FIG. 21 is an enlarged exploded perspective view showing a connecting portion by a fixture FS, and FIG. Respectively. In the example of the fixture FS shown in these drawings, the electrode terminal 12B is formed so that the plan view is L-shaped, and the folding surface 12b is extended in the longitudinal direction of the end surface of the battery cell. Two 13 and 13B are opened. Further, as shown in FIG. 21, a blind rivet 51 is inserted through one connecting hole 13 as a fixture FS and a spring washer as an elastic member 60, and the blind rivet 51 is inserted into the other connecting hole 13B. Is inserted into the detection terminal hole 71 of the voltage detection terminal 70B integrated with the spring washer shape as the elastic member 60B and fastened in a co-tightened state. Thus, the fastening structure is doubled to increase the reliability, and the voltage detection terminal 70B is arranged on one side, so that the intermediate voltage can be detected.

以上の例では、電圧検出用端子や弾性部材を折曲面の上面に配置している。この配置は、締結作業を簡素化できる。ただ、重ね合わせた折曲面同士の間に電圧検出用端子を配置してもよい。   In the above example, the voltage detection terminal and the elastic member are arranged on the upper surface of the folding surface. This arrangement can simplify the fastening operation. However, a voltage detection terminal may be arranged between the folded surfaces that are overlapped.

さらに、上記の例では電極端子を断面L字状に折曲させ、固定具FSを電池セル端面の垂直方向に挿入する締結構造を説明した。この方法は、電池セルを組み上げた状態で電池セルの上面側から一気に固定具FSの締結作業を行える利点を有する。また、折曲面の折曲角度は、90°に限られず、若干傾斜させることもできる。すなわち、上側又は下側のいずれか一方の折曲面の傾斜に対応させて、他方の折曲面の傾斜角度を調整し、両者の和が180°になるようにすれば、折曲面を一致させて当接させることができる。折曲面を傾斜させることで、例えば電池セルの送り出しの際にスムーズに折曲面同士を当接させることができる等の利点が得られる。   Furthermore, in the above-described example, the fastening structure in which the electrode terminal is bent in an L-shaped cross section and the fixture FS is inserted in the direction perpendicular to the end face of the battery cell has been described. This method has an advantage that fastening work of the fixing tool FS can be performed at a stretch from the upper surface side of the battery cell in a state where the battery cell is assembled. Further, the bending angle of the folding surface is not limited to 90 °, and can be slightly inclined. That is, if the inclination angle of the other folding surface is adjusted to correspond to the inclination of either the upper or lower folding surface and the sum of the two is 180 °, the folding surfaces are matched. It can be made to contact. By inclining the folding surface, there can be obtained an advantage that, for example, the folding surfaces can be brought into contact with each other smoothly when the battery cells are sent out.

電池セル同士の連結は、各々の電極端子の先端に連結穴13を開口させた電池セルの先端を折曲して折曲面12aを形成し、電池セルを、電極端子を設けた端面をほぼ同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定具FSを用いて締結する。これにより、バスバーのような別部材を使用することなく、隣接する電池セルの電極端子同士を直接当接させて電気接続できる。また固定までの一連の生産工程を自動化又は半自動化することができ、電池パックの生産を効率化することができる。
(実施の形態2)
The battery cells are connected to each other by bending the end of the battery cell having the connection hole 13 opened at the end of each electrode terminal to form a bent surface 12a, and the end face provided with the electrode terminal is substantially the same. The electrode terminals of the adjacent battery cells are fastened using the fixture FS in a state where they are arranged in a plane. Thereby, without using another member like a bus bar, the electrode terminals of adjacent battery cells can be brought into direct contact with each other to be electrically connected. In addition, a series of production steps up to fixing can be automated or semi-automated, and the production of the battery pack can be made efficient.
(Embodiment 2)

一方で、これに限られず、電池セル端面と水平方向に固定具FSを挿入する構成も採用できる。実施の形態2に係る電池パックとして、このような電池パックの例を、図23及び図24に基づいて説明する。これらの図において、図23は電池セル10B同士を連結した状態を示す斜視図、図24は側面図を、それぞれ示している。これらの図に示す電池パックは、図24に示す電池セル10Bを積層して、電池セル10B同士の電極端子12Cをリベットで固定している。電池セル10Bは、図4等に示す電池セル10と同様に、正極と負極の電極端子12Cを上部の端面から、左右対称の位置に離間させて突出させている。ただ、電極端子12C端部の折曲面12cが電池セル10B端面と平行でなく、ほぼ垂直となるように電極端子12Cを折曲させている。具体的には、各電極端子12Cの折曲位置を2カ所として、第1の折曲により電極端子12Cが電池セル10Bの端面から斜め方向に突出するよう折曲される。この際、各電極端子12Cを各々反対の斜め方向に突出させる。さらに第2の折曲により折曲面12cが電池セル10Bの端面に対してほぼ垂直な姿勢に折曲される。このとき、折曲面12cが電池セル10Bの側面とほぼ同一平面に位置するように設定する。これにより、電池セル10B同士を積層すると、隣接する電池セル10Bの正極と負極の折曲面12c同士を当接できる。   On the other hand, it is not restricted to this, The structure which inserts the fixing tool FS in a horizontal direction with a battery cell end surface is also employable. As a battery pack according to Embodiment 2, an example of such a battery pack will be described with reference to FIGS. In these drawings, FIG. 23 is a perspective view showing a state in which the battery cells 10B are connected to each other, and FIG. 24 is a side view. In the battery pack shown in these drawings, the battery cells 10B shown in FIG. 24 are stacked, and the electrode terminals 12C of the battery cells 10B are fixed with rivets. In the battery cell 10B, similarly to the battery cell 10 shown in FIG. 4 and the like, the positive electrode terminal 12C and the negative electrode terminal 12C are protruded from the upper end surface at a symmetrical position. However, the electrode terminal 12C is bent so that the bent surface 12c at the end of the electrode terminal 12C is not parallel to the end surface of the battery cell 10B but is substantially vertical. Specifically, with each electrode terminal 12C being bent at two positions, the electrode terminal 12C is bent so as to protrude obliquely from the end face of the battery cell 10B by the first bending. At this time, each electrode terminal 12C is protruded in the opposite oblique direction. Further, the bent surface 12c is bent in a substantially vertical posture with respect to the end surface of the battery cell 10B by the second bending. At this time, the folding surface 12c is set to be substantially flush with the side surface of the battery cell 10B. Thereby, when battery cell 10B is laminated | stacked, the folding surface 12c of the positive electrode and negative electrode of adjacent battery cell 10B can be contact | abutted.

この電池セル10Bは、電極端子12Cを板状に突出させたまま製造され、電池セル10Bの製造後に電極端子12Cを折曲加工し、それぞれ逆向きの斜め方向に伸びるように2カ所を折曲される。この電池セル10Bを順次積層して、連結穴13Cをリベット止めして固定していく。またリベット止めはリベッティングマシンで自動的に行われる。
(実施の形態3)
The battery cell 10B is manufactured with the electrode terminal 12C protruding in a plate shape. After the battery cell 10B is manufactured, the electrode terminal 12C is bent and bent at two locations so as to extend in opposite oblique directions. Is done. The battery cells 10B are sequentially stacked, and the connection holes 13C are riveted and fixed. Riveting is done automatically by a riveting machine.
(Embodiment 3)

以上の例では、固定具をリベットで構成したが、固定具はこれに限らず他の構成、例えばボルトとナットで構成することもできる。実施の形態3として、L字状に折曲した折曲面12aをボルト52とナット53で固定する例を図25〜図26に基づいて説明する。これらの図において、図25は電池パック500の斜視図、図26は側面図をそれぞれ示す。これらの図に示す電池パック500は、電池セルやセパレータ、エンドプレート等の構造は上述した図1と同様の構成が使用でき、詳細説明を省略する。固定具FSとしては、ボルト52とナット53を使用し、折曲面12aの上面側からボルト52を連結穴13に挿通し、下側にナット53を配置して螺合する。ナット53は四角ナット、6角ナット等の角形ナットを使用することで螺合を容易にする。螺合によって、一旦連結した電池セルの固定状態を解除し、再び分解することも可能となる。一方、螺合の際に折曲面12aの下側でナット53を保持する機構が必要となり、作業性が悪くなる。   In the above example, the fixing tool is configured with rivets, but the fixing tool is not limited to this, and may be configured with other configurations such as bolts and nuts. As a third embodiment, an example in which a bent surface 12a bent in an L shape is fixed with a bolt 52 and a nut 53 will be described with reference to FIGS. In these drawings, FIG. 25 is a perspective view of the battery pack 500, and FIG. 26 is a side view. The battery pack 500 shown in these drawings can use the same structure as that of FIG. 1 described above for the structure of battery cells, separators, end plates, etc., and detailed description thereof will be omitted. As the fixture FS, a bolt 52 and a nut 53 are used. The bolt 52 is inserted into the connecting hole 13 from the upper surface side of the folding surface 12a, and the nut 53 is disposed on the lower side and screwed together. The nut 53 uses a square nut such as a square nut or a hexagon nut to facilitate screwing. It is possible to release the fixed state of the battery cells once connected by screwing and disassemble them again. On the other hand, a mechanism for holding the nut 53 on the lower side of the folding surface 12a is required at the time of screwing, and workability is deteriorated.

そこで、ナットを使用しない固定具を用いることでこの問題を解消できる。例えば、図27及び図28、図29に示すように、電池セル10Cの電極端子12Dの下側の折曲面12aの連結穴にバーリング加工して、ネジ溝を形成したバーリング部13Dを設ける。これらの図において、図27は電池パック600の斜視図、図28は側面図、図29は電池セル10Cの斜視図を、それぞれ示している。これにより、別途ナットを用意することなく螺合により確実に電池セル10Cを電気接続できる。バーリング加工は比較的容易であるため、安価かつ簡単に固定具を実現できる。バーリング部13Dは、アルミニウム製の電極端子12Dに設けることが好ましい。銅等と比較して柔らかく加工が容易だからである。   Therefore, this problem can be solved by using a fixture that does not use a nut. For example, as shown in FIG. 27, FIG. 28, and FIG. 29, a burring portion 13D having a thread groove is provided by burring the connecting hole of the lower curved surface 12a of the electrode terminal 12D of the battery cell 10C. In these drawings, FIG. 27 is a perspective view of the battery pack 600, FIG. 28 is a side view, and FIG. 29 is a perspective view of the battery cell 10C. Thereby, the battery cell 10C can be reliably electrically connected by screwing without preparing a separate nut. Since burring is relatively easy, a fixture can be realized easily and inexpensively. The burring portion 13D is preferably provided on the aluminum electrode terminal 12D. This is because it is softer and easier to process than copper.

また、図30〜図32に示すように、電池パック700を構成する電池セル10Dの下側の電極端子12Eの折曲面12aの連結穴と開口を一致させるようナットを固定したナット部13Eを設けてもよい。この構成は、バーリング部を使用する方法に比べ、強度的に強くできるという利点が得られる。ナットの固定は、折曲面12aにナットを溶接や接着で固定する方法や、プレスナットを用いる等の方法が利用できる。
(実施の形態4)
Further, as shown in FIGS. 30 to 32, a nut portion 13E is provided to which a nut is fixed so that the connection hole of the folding surface 12a of the lower electrode terminal 12E of the battery cell 10D constituting the battery pack 700 is aligned with the opening. May be. This configuration has the advantage of being stronger in strength than the method using the burring portion. For fixing the nut, a method of fixing the nut to the bent surface 12a by welding or bonding, a method of using a press nut, or the like can be used.
(Embodiment 4)

以上の例では、固定具を各折曲面12a毎に個別に用意して締結を行う場合を説明した。この方法では、折曲面12a毎に固定具を一々位置決めする必要があり、手間がかかるという問題もある。そこで、このような作業を省力化すべく、複数の固定具を一体化することもできる。この例を、図33〜図35に基づいて説明する。これらの図において、図33は電池パック800の分解斜視図、図34は分解図の平面図、図35は分解図の側面図を、それぞれ示している。この例で示す電池パック800は、複数のナットを予め所定間隔で固定した複数ナット固定具54を使用している。具体的には、ナットをインサート成型した複数のナット突出部と、ナット突出部を一定間隔で離間させて所定の姿勢に保持するよう、ナット突出部を一定間隔で固定する絶縁性部材とを一体成形している。ナット突出部は、断面L字状に折曲された折曲面12aの下面に挿入できる大きさに形成される。図33の例では、9つの電池セルを積層して直列接続するために、各側面に、4つのナット突出部を備える同形の複数ナット固定具54を配位置し、各ナット突出部が断面L字状電極端子12を重ねて形成される断面コ字状に挿入されるように位置決めして、各ナット突出部に埋め込まれたナットにボルト52を各々螺合する。これにより、ナットを各連結穴に位置決めする作業を一括して行うことができ、作業性を向上できる。   In the above example, a case has been described in which a fixing tool is separately prepared for each folding surface 12a and fastened. In this method, it is necessary to position the fixing tool for each folding surface 12a, and there is a problem that it takes time and effort. Therefore, in order to save such work, a plurality of fixtures can be integrated. This example will be described with reference to FIGS. In these drawings, FIG. 33 is an exploded perspective view of the battery pack 800, FIG. 34 is a plan view of the exploded view, and FIG. 35 is a side view of the exploded view. The battery pack 800 shown in this example uses a plurality of nut fixing tools 54 in which a plurality of nuts are fixed in advance at predetermined intervals. Specifically, a plurality of nut protrusions that are insert-molded nuts and an insulating member that fixes the nut protrusions at regular intervals so that the nut protrusions are spaced apart at regular intervals and held in a predetermined posture. Molding. The nut protruding portion is formed in a size that can be inserted into the lower surface of the folded curved surface 12a bent in an L-shaped cross section. In the example of FIG. 33, in order to stack nine battery cells and connect them in series, a plurality of identical nut fixtures 54 having four nut protrusions are arranged on each side surface, and each nut protrusion has a cross-section L The electrode terminals 12 are positioned so as to be inserted in a U-shaped cross section formed by overlapping, and bolts 52 are respectively screwed into the nuts embedded in the nut protrusions. Thereby, the operation | work which positions a nut to each connection hole can be performed collectively, and workability | operativity can be improved.

本発明の電池パック及びその製造方法は、電気自動車やハイブリッド自動車等の車両用電源装置として好適に適用できる。   The battery pack and the manufacturing method thereof according to the present invention can be suitably applied as a power supply device for a vehicle such as an electric vehicle or a hybrid vehicle.

本発明の実施の形態1に係る電池パックの外観斜視図である。1 is an external perspective view of a battery pack according to Embodiment 1 of the present invention. 図1の電池パックの側面図である。It is a side view of the battery pack of FIG. 図1の電池パックの固定具を示す分解斜視図である。It is a disassembled perspective view which shows the fixing tool of the battery pack of FIG. 電池パックを構成する電池セルの斜視図である。It is a perspective view of the battery cell which comprises a battery pack. 図4の電池セルの正面図である。It is a front view of the battery cell of FIG. 図4の電池セルの側面図である。It is a side view of the battery cell of FIG. リベットで固定した電極端子の折曲面の断面図である。It is sectional drawing of the folding surface of the electrode terminal fixed with the rivet. 弾性部材を備える固定具を示す分解斜視図である。It is a disassembled perspective view which shows a fixing tool provided with an elastic member. 図8の電池パックの分解側面図である。It is a disassembled side view of the battery pack of FIG. スプリングワッシャで固定する状態を示す分解斜視図である。It is a disassembled perspective view which shows the state fixed with a spring washer. 図10のスプリングワッシャで固定した状態を示す斜視図である。It is a perspective view which shows the state fixed with the spring washer of FIG. 各電池セルの中間電圧を検出する電圧検出用端子を接続した電池パックの斜視図である。It is a perspective view of the battery pack which connected the terminal for voltage detection which detects the intermediate voltage of each battery cell. 図12の電圧検出用端子の連結部分の拡大図である。It is an enlarged view of the connection part of the terminal for voltage detection of FIG. 図12の電池パックの側面図である。It is a side view of the battery pack of FIG. 弾性部材を備える電圧検出用端子の連結部分を示す分解斜視図である。It is a disassembled perspective view which shows the connection part of the terminal for voltage detection provided with an elastic member. 図15の側面図である。FIG. 16 is a side view of FIG. 15. 電圧検出用端子と固定具を示す拡大分解斜視図である。It is an expansion exploded perspective view showing a voltage detection terminal and a fixture. 電圧検出用端子を固定した状態を示す拡大斜視図である。It is an expansion perspective view which shows the state which fixed the terminal for voltage detection. 電池パックの変形例の斜視図である。It is a perspective view of the modification of a battery pack. 図19の側面図である。FIG. 20 is a side view of FIG. 19. 固定具による連結部分を示す拡大分解斜視図である。It is an expansion disassembled perspective view which shows the connection part by a fixing tool. 締結状態を示す拡大斜視図である。It is an expansion perspective view which shows a fastening state. 実施の形態2に係る電池セル同士を連結した状態を示す斜視図である。It is a perspective view which shows the state which connected the battery cells which concern on Embodiment 2. FIG. 図23の電池セル連結体の側面図である。It is a side view of the battery cell coupling body of FIG. 実施の形態3に係る電池パックの斜視図である。6 is a perspective view of a battery pack according to Embodiment 3. FIG. 図25の電池パックの側面図である。It is a side view of the battery pack of FIG. 連結穴にバーリング加工した電池パックの斜視図である。It is a perspective view of the battery pack which carried out the burring process to the connection hole. 図27の電池パックの側面図である。It is a side view of the battery pack of FIG. 図27の電池セルの斜視図である。It is a perspective view of the battery cell of FIG. 下側の折曲面にナット部を設けた電池パックの斜視図である。It is a perspective view of the battery pack which provided the nut part in the lower folding surface. 図30の電池パックの側面図である。It is a side view of the battery pack of FIG. 図30の電池セルの斜視図である。It is a perspective view of the battery cell of FIG. 複数ナット固定具を使用した電池パックの分解斜視図である。It is a disassembled perspective view of the battery pack using a multiple nut fixture. 図33の電池パックの分解平面図である。FIG. 34 is an exploded plan view of the battery pack of FIG. 33. 図33の電池パックの分解側面図である。FIG. 34 is an exploded side view of the battery pack of FIG. 33. 従来のバスバーを用いて電池セルを電気接続した電池パックを示す斜視図である。It is a perspective view which shows the battery pack which electrically connected the battery cell using the conventional bus bar.

符号の説明Explanation of symbols

100〜800…電池パック
10、10B〜10D、10F…電池セル
12、12B〜12E、12F…電極端子
12a〜12c…折曲面
13、13B〜13C…連結穴
13D…バーリング部
13E…ナット部
14…端子リブ
20…セパレータ
30…エンドプレート
32…ネジ穴
34…延長ボルト
51…ブラインドリベット
52…ボルト
53…ナット
54…複数ナット固定具
60、60B…弾性部材
70、70B…電圧検出用端子
71…検出端子穴
FS…固定具
BB…バスバー
DESCRIPTION OF SYMBOLS 100-800 ... Battery pack 10, 10B-10D, 10F ... Battery cell 12, 12B-12E, 12F ... Electrode terminal 12a-12c ... Folding curved surface 13, 13B-13C ... Connecting hole 13D ... Burring part 13E ... Nut part 14 ... Terminal rib 20 ... Separator 30 ... End plate 32 ... Screw hole 34 ... Extension bolt 51 ... Blind rivet 52 ... Bolt 53 ... Nut 54 ... Multi-nut fixing tool 60, 60B ... Elastic member 70, 70B ... Voltage detection terminal 71 ... Detection Terminal hole FS ... Fixing tool BB ... Bus bar

Claims (26)

複数の電池セルを隣接させ、互いに直列及び/又は並列に接続した電池パックであって、
正負の電極端子を一方の端面から突出させた複数の電池セルと、
前記電池セルを、電極端子を設けた端面を略同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定状態に連結するための固定具と、
を備え、
前記電極端子は、板状に形成され、板状電極端子は電池セルの端面から上方に突出させ、先端を折曲して折曲面を有しており、
隣接する電池セルの電極端子の折曲面同士を重ね合わせた状態に当接させて、前記固定具で固定状態に連結してなることを特徴とする電池パック。
A battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other,
A plurality of battery cells in which positive and negative electrode terminals protrude from one end surface;
A fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state where the battery cells are arranged in a state where the end surfaces provided with the electrode terminals are substantially aligned on the same plane,
With
The electrode terminal is formed in a plate shape, the plate electrode terminal protrudes upward from the end surface of the battery cell, has a bent curved surface by bending the tip,
A battery pack, wherein the folded surfaces of electrode terminals of adjacent battery cells are brought into contact with each other in a superposed state and connected in a fixed state by the fixing tool.
請求項1に記載の電池パックであって、
前記固定具は、折曲面に開口された連結穴に挿通させる挿通体を備えており、
連結穴を形成した折曲面同士を当接させた状態で、前記挿通体が電池セルの端面に対して略垂直な方向に貫通されるよう構成されてなることを特徴とする電池パック。
The battery pack according to claim 1,
The fixture includes an insertion body that is inserted through a connection hole that is opened in a folding surface.
A battery pack, wherein the insertion body is configured to penetrate in a direction substantially perpendicular to the end face of the battery cell in a state where the bent curved surfaces in which the connection holes are formed are in contact with each other.
請求項1に記載の電池パックであって、
前記固定具は、折曲面に開口された連結穴を貫通させる挿通体を備えており、
前記挿通体が電池セルの端面に対して略平行な方向に貫通されるよう構成されてなることを特徴とする電池パック。
The battery pack according to claim 1,
The fixing device includes an insertion body that passes through a connection hole that is opened in a folding surface,
The battery pack, wherein the insertion body is configured to penetrate in a direction substantially parallel to an end face of the battery cell.
請求項1から3のいずれか一に記載の電池パックであって、
前記電池セルが角形電池であり、
前記電極端子は電池セルの端面から斜め方向に突出するよう折曲され、かつ折曲面が電池セルの端面に対して略垂直な姿勢に折曲されると共に、角形電池セルの側面と略同一平面に位置されてなることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 3,
The battery cell is a prismatic battery;
The electrode terminal is bent so as to protrude obliquely from the end face of the battery cell, and the bent surface is bent in a posture substantially perpendicular to the end face of the battery cell, and is substantially flush with the side face of the prismatic battery cell. A battery pack characterized by being located in
請求項1から4のいずれか一に記載の電池パックであって、
前記電池セルの端面から電極端子が一対、離間されて突出されており、各電極端子は相互に異なる方向に斜め方向に突出するよう構成されてなることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 4,
A battery pack, wherein a pair of electrode terminals protrudes from the end face of the battery cell so as to be spaced apart, and each electrode terminal protrudes obliquely in different directions.
請求項2から5のいずれか一に記載の電池パックであって、
前記連結穴が長孔であることを特徴とする電池パック。
The battery pack according to any one of claims 2 to 5,
The battery pack, wherein the connection hole is a long hole.
請求項2から5のいずれか一に記載の電池パックであって、
前記連結穴に代えて、前記折曲面に切り欠き形状を形成してなることを特徴とする電池パック。
The battery pack according to any one of claims 2 to 5,
Instead of the connection hole, the battery pack is formed by forming a notch shape in the folding surface.
請求項3から7のいずれか一に記載の電池パックであって、
前記電池セルが角形電池であり、
前記電極端子は電池セルの端面から略垂直方向に突出され、かつ先端を端面と平行になるように断面略L字状に折曲して水平折曲面としてなり、隣接する電池セル同士で水平折曲面を重ねて前記固定具で連結するよう構成されてなることを特徴とする電池パック。
The battery pack according to any one of claims 3 to 7,
The battery cell is a prismatic battery;
The electrode terminal protrudes from the end surface of the battery cell in a substantially vertical direction, and the tip is bent into a substantially L-shaped cross section so as to be parallel to the end surface to form a horizontal folding surface. A battery pack configured to overlap curved surfaces and to be connected by the fixture.
請求項3から8のいずれか一に記載の電池パックであって、
前記一対の電極端子の水平折曲面を重ねて前記固定具で連結する部分において、上側に重ねる水平折曲面の折り曲げ角度が90°以下であり、下側に重ねる水平折曲面の折り曲げ角度が90°以上であり、両者の和が略180°であることを特徴とする電池パック。
The battery pack according to any one of claims 3 to 8,
In the portion where the horizontal folding surfaces of the pair of electrode terminals are overlapped and connected by the fixture, the bending angle of the horizontal folding surface superimposed on the upper side is 90 ° or less, and the folding angle of the horizontal folding surface stacked on the lower side is 90 °. It is above, The sum of both is about 180 degrees, The battery pack characterized by the above-mentioned.
請求項3から9のいずれか一に記載の電池パックであって、
前記一対の電極端子は、一方の折曲方向が他方の折曲方向と逆向きに折曲されてなることを特徴とする電池パック。
The battery pack according to any one of claims 3 to 9,
The battery pack, wherein the pair of electrode terminals is bent in a direction in which one bending direction is opposite to the other bending direction.
請求項3から10のいずれか一に記載の電池パックであって、
前記一対の電極端子の一方の折曲位置が、他方の折曲位置よりも電極端子の厚さに相当する分だけ低くして折曲されてなることを特徴とする電池パック。
The battery pack according to any one of claims 3 to 10,
The battery pack, wherein one of the pair of electrode terminals is bent at a lower position than the other bent position by an amount corresponding to the thickness of the electrode terminal.
請求項1から11のいずれか一に記載の電池パックであって、
前記固定具が、リベットであることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 11,
The battery pack, wherein the fixture is a rivet.
請求項1から12のいずれか一に記載の電池パックであって、
前記固定具が、ブラインドリベットであることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 12,
The battery pack, wherein the fixture is a blind rivet.
請求項1から12のいずれか一に記載の電池パックであって、
前記固定具が、ボルト及びナットを含むことを特徴とする電池パック。
The battery pack according to any one of claims 1 to 12,
The battery pack, wherein the fixture includes a bolt and a nut.
請求項13に記載の電池パックであって、
電池セルの端面から突出させた電極端子の金属が正極と負極で異なっており、
隣接する電池セルの折曲面を重ね合わせる際、強度の強い電極端子を下側に位置させて固定具であるブラインドリベットで上側から固定するよう構成してなることを特徴とする電池パック。
The battery pack according to claim 13,
The metal of the electrode terminal protruding from the end face of the battery cell is different between the positive electrode and the negative electrode,
A battery pack comprising a configuration in which when a folded surface of adjacent battery cells is overlapped, a strong electrode terminal is positioned on the lower side and fixed from above with a blind rivet as a fixture.
請求項1から15のいずれか一に記載の電池パックであって、
前記固定具が、電極端子との当接面に弾性部材を介在させてなることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 15,
The battery pack, wherein the fixing member has an elastic member interposed on a contact surface with the electrode terminal.
請求項16に記載の電池パックであって、
前記弾性部材が、スプリングワッシャであることを特徴とする電池パック。
The battery pack according to claim 16, wherein
The battery pack, wherein the elastic member is a spring washer.
請求項1から17のいずれか一に記載の電池パックであって、さらに、
電池セルの電圧を測定するために電池セルの電極端子と電気的に接続される電圧検出用端子を備えており、
前記電圧検出用端子は、折曲面に開口された連結穴と略等しいかこれよりも大きい内径に検出端子穴を開口させており、
前記固定具が、隣接する電池セルの電極端子同士を連結する際に、電圧検出用の端子を共締めしてなることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 17, further comprising:
In order to measure the voltage of the battery cell, it has a voltage detection terminal electrically connected to the electrode terminal of the battery cell,
The voltage detection terminal has a detection terminal hole opened in an inner diameter substantially equal to or larger than a connection hole opened in a folding surface,
The battery pack is formed by fastening the voltage detection terminals together when the fixtures connect the electrode terminals of adjacent battery cells.
請求項18に記載の電池パックであって、
前記電圧検出用端子が、弾性部材を有しており、
前記弾性部材を前記固定具と電極端子との間に介在させるよう連結してなることを特徴とする電池パック。
The battery pack according to claim 18, wherein
The voltage detection terminal has an elastic member,
A battery pack, wherein the elastic member is connected to be interposed between the fixture and the electrode terminal.
請求項18又は19に記載の電池パックであって、
前記折曲面に、連結穴を2以上開口してなり、
各連結穴に固定具を貫通させて固定してなることを特徴とする電池パック。
The battery pack according to claim 18 or 19,
Two or more connecting holes are opened in the folding surface,
A battery pack, wherein a fixing tool is passed through each connecting hole and fixed.
請求項20に記載の電池パックであって、
一の連結穴に、弾性部材を配置して固定具と折曲面との間に挟み込み、
他の連結穴に、電圧検出用端子を配置して固定具と折曲面との間に挟み込むことを特徴とする電池パック。
The battery pack according to claim 20, wherein
In one connecting hole, an elastic member is placed and sandwiched between the fixture and the folding surface,
A battery pack, characterized in that a voltage detection terminal is disposed in another connecting hole and sandwiched between a fixture and a folding surface.
請求項14に記載の電池パックであって、
隣接する電池セルの電極端子の折曲面同士を重ね合わせた折曲面の連結穴に一方からボルトを挿通して他方をナットに螺合させて固定してなることを特徴とする電池パック。
The battery pack according to claim 14, wherein
A battery pack, wherein a bolt is inserted from one side into a connecting hole having a bent surface obtained by overlapping the bent surfaces of electrode terminals of adjacent battery cells, and the other is screwed into a nut and fixed.
請求項1から12のいずれか一に記載の電池パックであって、
前記固定具が、ボルトと、一方の折曲面の連結穴にバーリング加工してネジ溝を形成したバーリング部を含み、
隣接する電池セルの電極端子の折曲面同士を、バーリング部を有する折曲面が下方に位置するように重ね合わせ、連結穴の上方からボルトを挿通して、バーリング部のネジ溝に螺合させて固定してなることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 12,
The fixture includes a bolt and a burring portion in which a thread groove is formed by burring a connection hole of one folding surface,
The folding surfaces of the electrode terminals of adjacent battery cells are overlapped so that the folding surface having the burring portion is positioned below, and a bolt is inserted from above the connecting hole and screwed into the screw groove of the burring portion. A battery pack characterized by being fixed.
請求項1から12のいずれか一に記載の電池パックであって、
前記固定具が、ボルトと、一方の折曲面の連結穴に開口を一致させるようナットを固定したナット部を含み、
隣接する電池セルの電極端子の折曲面同士を、ナット部を有する折曲面が下方に位置するように重ね合わせ、連結穴の上方からボルトを挿通して、ナット部に螺合させて固定してなることを特徴とする電池パック。
The battery pack according to any one of claims 1 to 12,
The fixture includes a bolt and a nut portion that fixes a nut so that the opening coincides with a connection hole of one folding surface,
Overlay the folding surfaces of the electrode terminals of adjacent battery cells so that the folding surface with the nut part is positioned below, and insert the bolt from above the connection hole and screw it into the nut part and fix it. The battery pack characterized by becoming.
複数の電池セルを隣接させ、互いに直列及び/又は並列に接続した電池パックであって、
正負の電極端子を一方の端面から突出させた複数の電池セルと、
前記電池セルを、電極端子を設けた端面を略同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定状態に連結するための固定具と、
を備え、
前記電極端子は、板状に形成され、板状電極端子は電池セルの端面から上方に突出させ、先端を、断面略L字状に折曲して折曲面を有し、折曲面には連結穴が開口されており、

前記固定具が、前記連結穴に挿通されるボルトと、前記ボルトに螺合するナットであって、複数の電池セルを重ね合わせた状態で各電池セルの折曲面の位置に合致させるように、ナットを一定間隔で離間させて所定の姿勢に保持する絶縁性部材で構成され、絶縁性部材の一面から一定間隔でナットを設けたナット突出部が突出されており、
前記ナット突出部は、断面略L字状に折曲された電極端子の、折曲面の下面に挿入できる大きさに形成されてなり、
複数の電池セルを重ね合わせて各折曲面を当接させ、連結穴を一致させるよう位置決めした状態で、電池パックの側面から絶縁性部材を、前記ナット突出部が各々折曲面の下面に挿入するように配置し、この状態でボルトを各々の連結穴に挿入し、ナット突出部のナットと螺合して連結するよう構成してなることを特徴とする電池パック。
A battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other,
A plurality of battery cells in which positive and negative electrode terminals protrude from one end surface;
A fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state where the battery cells are arranged in a state where the end surfaces provided with the electrode terminals are substantially aligned on the same plane,
With
The electrode terminal is formed in a plate shape, the plate electrode terminal protrudes upward from the end surface of the battery cell, the tip is bent into a substantially L-shaped cross section, has a curved surface, and is connected to the folded surface. The hole is open,

The fixing tool is a bolt inserted into the connection hole and a nut screwed into the bolt, and in a state where a plurality of battery cells are overlapped with each other, to match the position of the folding surface of each battery cell, It is composed of an insulating member that keeps the nuts spaced apart at a predetermined interval and holds them in a predetermined posture, and a nut protruding portion provided with the nuts at a constant interval protrudes from one surface of the insulating member,
The nut protrusion is formed in a size that can be inserted into the lower surface of the bent surface of the electrode terminal bent in a substantially L-shaped cross section,
In a state where a plurality of battery cells are overlapped to contact each folding surface and are positioned so that the connecting holes are aligned, the insulating member is inserted from the side surface of the battery pack, and the nut protrusions are inserted into the lower surface of the folding surface, respectively. In this state, the battery pack is configured such that a bolt is inserted into each of the connection holes, and is screwed and connected to the nut of the nut protrusion.
複数の電池セルを隣接させ、互いに直列及び/又は並列に接続した電池パックの製造方法であって、
前記電池セルの端面から上方に突出させた板状の電極端子の先端に連結穴を開口させておき、該先端を折曲して折曲面を形成する工程と、
前記電池セルを、電極端子を設けた端面を略同一平面に揃えた状態で配列した状態にて、隣接する電池セルの電極端子同士を固定具を用いて固定状態に連結する工程と、
を含むことを特徴とする電池パックの製造方法。
A method of manufacturing a battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other,
Opening a connection hole at the tip of a plate-like electrode terminal protruding upward from the end face of the battery cell, and bending the tip to form a bent surface;
In the state where the battery cells are arranged in a state where the end surfaces provided with the electrode terminals are substantially aligned on the same plane, the electrode terminals of adjacent battery cells are connected to each other in a fixed state using a fixture,
The manufacturing method of the battery pack characterized by including.
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