JP6582612B2

JP6582612B2 - Battery module

Info

Publication number: JP6582612B2
Application number: JP2015127728A
Authority: JP
Inventors: 直人守作; 浩生植田; 加藤　崇行; 崇行加藤
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2015-06-25
Filing date: 2015-06-25
Publication date: 2019-10-02
Anticipated expiration: 2035-06-25
Also published as: JP2017010880A

Description

本発明は、電池モジュールに関する。 The present invention relates to a battery module.

特許文献１には、バッテリーパック管理装置が記載されている。このバッテリーパック管理装置は、締結感知部及び制御部を含む。バッテリーパックは、複数のバッテリーモジュール及びバスバーを含む。バッテリーモジュールには、電極端子が設けられている。バスバーは、ナットと共にバッテリーモジュールの電極端子に締結される。締結感知部は、バスバーの締結状態を感知する。締結感知部は、圧力センサにより構成される。 Patent Document 1 describes a battery pack management device. The battery pack management device includes a fastening detection unit and a control unit. The battery pack includes a plurality of battery modules and a bus bar. The battery module is provided with electrode terminals. The bus bar is fastened to the electrode terminal of the battery module together with the nut. The fastening sensing unit senses the fastening state of the bus bar. The fastening sensing unit is composed of a pressure sensor.

特表２０１４−５０７７５７号公報Special table 2014-507757 gazette

ところで、上述したバッテリーモジュール（電池モジュール）においては、複数の電池セルの電極端子が配列される位置の上部に、例えばハーネス等を取り回すスペースを形成する場合がある。その場合、電極端子にバスバーを締結するに際して、電極端子とバスバーとの間に、スペーサとして機能する導電部材を介在させることが考えられる。この場合、電極端子と当該導電部材との締結、及び、導電部材とバスバーとの締結といったように、電極端子とバスバーとの間に複数の締結箇所が生じ得る。このとき、複数の締結箇所の締結状態をなるべく簡単な構成により検出することが望まれる。 By the way, in the battery module (battery module) described above, there may be a case where a space around a harness or the like is formed above the position where the electrode terminals of a plurality of battery cells are arranged. In that case, when the bus bar is fastened to the electrode terminal, a conductive member that functions as a spacer may be interposed between the electrode terminal and the bus bar. In this case, a plurality of fastening points may be generated between the electrode terminal and the bus bar, such as fastening of the electrode terminal and the conductive member and fastening of the conductive member and the bus bar. At this time, it is desirable to detect the fastening state of a plurality of fastening locations with a configuration as simple as possible.

本発明は、そのような事情に鑑みてなされたものであり、複数の締結箇所の締結状態を簡単な構成により検出可能な電池モジュールを提供することを目的とする。 This invention is made | formed in view of such a situation, and it aims at providing the battery module which can detect the fastening state of a several fastening location by simple structure.

上記課題を解決するために、本発明に係る電池モジュールは、電極端子が突設された電池セルと、電極端子に電気的に接続されるバスバーと、一端部及び他端部と、一端部と他端部との間の中間部と、を含み、一端部において電極端子に締結されると共に他端部においてバスバーに締結されることにより、電極端子とバスバーとの間の導電経路を形成する導電部材と、一端部又は他端部に締結され、電極端子と一端部との締結状態、及び、他端部とバスバーとの締結状態を検出するための検出端子と、を備える。 In order to solve the above-described problems, a battery module according to the present invention includes a battery cell having an electrode terminal projecting therefrom, a bus bar electrically connected to the electrode terminal, one end and the other end, and one end. An intermediate portion between the electrode terminal and the other end, and is fastened to the electrode terminal at one end and fastened to the bus bar at the other end, thereby forming a conductive path between the electrode terminal and the bus bar. A member, and a detection terminal that is fastened to one end or the other end and detects a fastening state between the electrode terminal and the one end and a fastening state between the other end and the bus bar.

この電池モジュールは、電極端子とバスバーとの両方に締結されることにより、電極端子とバスバーとの間の導電経路を形成する導電部材を備えている。電極端子は、導電部材の一端部に締結され、バスバーは導電部材の他端部に締結される。したがって、電極端子上には、導電部材の中間部の高さに相当するスペースが形成される。一方、電極端子とバスバーとの間に導電部材を介在させることにより、電極端子と導電部材の一端部との締結、及び、導電部材の他端部とバスバーとの締結といったように、複数（ここでは２つ）の締結箇所が生じる。これに対して、この電池モジュールにおいては、それぞれの締結箇所の締結状態を検出するための検出端子を導電部材の一端部又は他端部に締結する。これにより、簡単な構成により複数の締結箇所の締結状態を検出することが可能となる。 The battery module includes a conductive member that forms a conductive path between the electrode terminal and the bus bar by being fastened to both the electrode terminal and the bus bar. The electrode terminal is fastened to one end of the conductive member, and the bus bar is fastened to the other end of the conductive member. Therefore, a space corresponding to the height of the intermediate portion of the conductive member is formed on the electrode terminal. On the other hand, by interposing a conductive member between the electrode terminal and the bus bar, a plurality of (here, fastening of the electrode terminal and one end of the conductive member and fastening of the other end of the conductive member and the bus bar) Then two) fastening points are generated. On the other hand, in this battery module, the detection terminal for detecting the fastening state of each fastening location is fastened to one end or the other end of the conductive member. Thereby, it becomes possible to detect the fastening state of a some fastening location by simple structure.

本発明に係る電池モジュールにおいては、他端部は、円柱状に形成されており、中間部は、他端部よりも大きな柱状に形成されており、一端部、他端部、及び、中間部は、互いに一体に形成されており、他端部は、他端部と中間部との間の段差部にバスバーを配置した状態においてナットが螺合されることによりバスバーに締結され、検出端子は、段差部とバスバーとの間に介在されていてもよい。ここでは、一体的に構成された導電部材の一端部が電極端子に締結され、他端部がナットの螺合によりバスバーに締結される。この場合、導電部材の他端部と中間部との段差部とバスバーとの間に検出端子を介在させれば、単一の検出端子によって、導電部材の一端部と電極端子との間の締結状態、及び、導電部材の他端部とバスバーとの締結状態の両方を検出することが可能である。特に、この場合には、検出端子がバスバーよりも電極端子側に配置される。このため、検出端子の配線の取り回しが容易であり、組付け性が損なわれ難い。 In the battery module according to the present invention, the other end portion is formed in a columnar shape, and the intermediate portion is formed in a columnar shape larger than the other end portion, and the one end portion, the other end portion, and the intermediate portion. Are formed integrally with each other, and the other end portion is fastened to the bus bar by screwing a nut in a state where the bus bar is disposed in a stepped portion between the other end portion and the intermediate portion, and the detection terminal is In addition, it may be interposed between the stepped portion and the bus bar. Here, one end portion of the integrally formed conductive member is fastened to the electrode terminal, and the other end portion is fastened to the bus bar by screwing the nut. In this case, if the detection terminal is interposed between the step portion between the other end portion and the intermediate portion of the conductive member and the bus bar, the fastening between the one end portion of the conductive member and the electrode terminal is performed by a single detection terminal. It is possible to detect both the state and the fastening state between the other end of the conductive member and the bus bar. In particular, in this case, the detection terminal is disposed closer to the electrode terminal than the bus bar. For this reason, the wiring of the detection terminal is easy to handle, and the assembling property is not easily lost.

本発明に係る電池モジュールにおいては、他端部は、円柱状に形成されており、中間部は、他端部よりも大きな柱状に形成されており、一端部、他端部、及び、中間部は、互いに一体に形成されており、他端部は、他端部と中間部との間の段差部にバスバーを配置した状態においてナットが螺合されることによりバスバーに締結され、検出端子は、バスバーとナットとの間に介在されていてもよい。ここでは、一体的に構成された導電部材の一端部が電極端子に締結され、他端部がナットの螺合によりバスバーに締結される。この場合、バスバーとナットとの間に検出端子を介在させれば、単一の検出端子によって、導電部材の一端部と電極端子との間の締結状態、及び、導電部材の他端部とバスバーとの締結状態の両方を検出することが可能である。特に、この場合には、検出端子がバスバーよりも電極端子から離れて配置される。このため、検出端子が、電極端子とバスバーとの間の導電経路に影響を及ぼし難い。 In the battery module according to the present invention, the other end portion is formed in a columnar shape, and the intermediate portion is formed in a columnar shape larger than the other end portion, and the one end portion, the other end portion, and the intermediate portion. Are formed integrally with each other, and the other end portion is fastened to the bus bar by screwing a nut in a state where the bus bar is disposed in a stepped portion between the other end portion and the intermediate portion, and the detection terminal is In addition, it may be interposed between the bus bar and the nut. Here, one end portion of the integrally formed conductive member is fastened to the electrode terminal, and the other end portion is fastened to the bus bar by screwing the nut. In this case, if a detection terminal is interposed between the bus bar and the nut, the fastening state between the one end of the conductive member and the electrode terminal and the other end of the conductive member and the bus bar are obtained by a single detection terminal. It is possible to detect both of the fastening state. In particular, in this case, the detection terminal is arranged farther from the electrode terminal than the bus bar. For this reason, the detection terminal hardly affects the conductive path between the electrode terminal and the bus bar.

本発明に係る電池モジュールにおいては、電極端子には、第１のネジ孔が形成されており、一端部は、第１のネジ孔に螺合されることにより電極端子に締結されてもよい。或いは、本発明に係る電池モジュールにおいては、導電部材の一端部側の一端面には、第２のネジ孔が形成されており、一端部は、第２のネジ孔に電極端子が螺合されることにより電極端子に締結されてもよい。これらのように、導電部材の一端部を雄ネジとしてもよいし雌ネジとしてもよい。 In the battery module according to the present invention, the electrode terminal may be formed with a first screw hole, and one end may be fastened to the electrode terminal by being screwed into the first screw hole. Alternatively, in the battery module according to the present invention, a second screw hole is formed on one end surface of the conductive member on one end portion side, and an electrode terminal is screwed into the second screw hole on one end portion. It may be fastened to the electrode terminal. As described above, one end of the conductive member may be a male screw or a female screw.

本発明に係る電池モジュールにおいては、導電部材の一端部側の一端面には、第２のネジ孔が形成されており、導電部材の他端部側の他端面には、第３のネジ孔が形成されており、一端部、他端部、及び、中間部は、互いに一体に形成されており、一端部は、第２のネジ孔に電極端子が螺合されることにより電極端子に締結され、他端部は、他端面上にバスバーを配置した状態において第３のネジ孔にボルトが螺合されることによりバスバーに締結され、検出端子は、バスバーと他端面との間に介在されていてもよい。このように、導電部材の一端部及び他端部を雌ネジとした場合であっても、導電部材の他端部側の端面とバスバーとの間に検出端子を介在させれば、単一の検出端子によって、導電部材の一端部と電極端子との間の締結状態、及び、導電部材の他端部とバスバーとの締結状態の両方を検出することが可能である。特に、この場合には、検出端子がバスバーよりも電極端子側に配置される。このため、検出端子の配線の取り回しが容易であり、組付け性が損なわれ難い。 In the battery module according to the present invention, a second screw hole is formed on one end surface of the conductive member on one end portion side, and a third screw hole is formed on the other end surface on the other end portion side of the conductive member. The one end portion, the other end portion, and the intermediate portion are formed integrally with each other, and the one end portion is fastened to the electrode terminal by screwing the electrode terminal into the second screw hole. The other end is fastened to the bus bar by screwing a bolt into the third screw hole in a state where the bus bar is disposed on the other end surface, and the detection terminal is interposed between the bus bar and the other end surface. It may be. Thus, even when one end and the other end of the conductive member are female screws, if the detection terminal is interposed between the end surface on the other end of the conductive member and the bus bar, With the detection terminal, it is possible to detect both the fastening state between the one end of the conductive member and the electrode terminal and the fastening state between the other end of the conductive member and the bus bar. In particular, in this case, the detection terminal is disposed closer to the electrode terminal than the bus bar. For this reason, the wiring of the detection terminal is easy to handle, and the assembling property is not easily lost.

本発明に係る電池モジュールにおいては、導電部材の一端部側の一端面には、第２のネジ孔が形成されており、導電部材の他端部側の他端面には、第３のネジ孔が形成されており、一端部、他端部、及び、中間部は、互いに一体に形成されており、一端部は、第２のネジ孔に電極端子が螺合されることにより電極端子に締結され、他端部は、他端面上にバスバーを配置した状態において第３のネジ孔にボルトが螺合されることによりバスバーに締結され、検出端子は、バスバーとボルトの頭部との間に介在されていてもよい。この場合にも、単一の検出端子によって、導電部材の一端部と電極端子との間の締結状態、及び、導電部材の他端部とバスバーとの締結状態の両方を検出することが可能である。特に、この場合には、検出端子がバスバーよりも電極端子から離れて配置される。このため、検出端子が、電極端子とバスバーとの間の導電経路に影響を及ぼし難い。 In the battery module according to the present invention, a second screw hole is formed on one end surface of the conductive member on one end portion side, and a third screw hole is formed on the other end surface on the other end portion side of the conductive member. The one end portion, the other end portion, and the intermediate portion are formed integrally with each other, and the one end portion is fastened to the electrode terminal by screwing the electrode terminal into the second screw hole. The other end is fastened to the bus bar by screwing the bolt into the third screw hole in a state where the bus bar is disposed on the other end surface, and the detection terminal is interposed between the bus bar and the head of the bolt. It may be interposed. Also in this case, it is possible to detect both the fastening state between the one end portion of the conductive member and the electrode terminal and the fastening state between the other end portion of the conductive member and the bus bar by a single detection terminal. is there. In particular, in this case, the detection terminal is arranged farther from the electrode terminal than the bus bar. For this reason, the detection terminal hardly affects the conductive path between the electrode terminal and the bus bar.

本発明に係る電池モジュールにおいては、導電部材は、中間部を構成する筒状部材と、一端部及び他端部を構成し筒状部材に挿通された棒状部材と、を有してもよい。この場合、棒状部材によって、電極端子とバスバーとの間の締結を実現しつつ、筒状部材によって、電極端子とバスバーとの間の導電経路を形成可能である。つまり、棒状部材を締結の強度が確保可能な材料により構成する一方で、筒状部材を導電性の高い材料により構成することが可能となる。 In the battery module according to the present invention, the conductive member may include a cylindrical member that configures the intermediate portion, and a rod-shaped member that includes one end and the other end and is inserted through the cylindrical member. In this case, the conductive path between the electrode terminal and the bus bar can be formed by the cylindrical member while the fastening between the electrode terminal and the bus bar is realized by the rod-shaped member. That is, while the rod-shaped member is made of a material that can secure the fastening strength, the cylindrical member can be made of a highly conductive material.

本発明に係る電池モジュールにおいては、棒状部材は、棒状部材の延在方向に沿って筒状部材に対して移動可能なように筒状部材に挿通されており、他端部は、他端部と中間部との間の段差部にバスバーを配置した状態においてナットが螺合されることによりバスバーに締結され、検出端子は、一端部と中間部との間の段差部と、電極端子との間に介在されていてもよい。この場合、検出端子を導電部材の一端部と中間部との間の段差部に介在させれば、単一の検出端子によって、導電部材の一端部と電極端子との間の締結状態、及び、導電部材の他端部とバスバーとの締結状態の両方を検出することが可能である。特に、この場合には、検出端子がより電極端子に近い位置に配置されるので、組付け性がより損なわれ難い。 In the battery module according to the present invention, the rod-shaped member is inserted through the tubular member so as to be movable with respect to the tubular member along the extending direction of the rod-shaped member, and the other end portion is the other end portion. In the state where the bus bar is disposed in the stepped portion between the intermediate portion and the intermediate portion, the nut is screwed to be fastened to the busbar, and the detection terminal is formed between the stepped portion between the one end portion and the intermediate portion and the electrode terminal. It may be interposed between them. In this case, if the detection terminal is interposed in the step portion between the one end portion and the intermediate portion of the conductive member, the fastening state between the one end portion of the conductive member and the electrode terminal by a single detection terminal, and It is possible to detect both the fastening state between the other end of the conductive member and the bus bar. In particular, in this case, since the detection terminal is disposed at a position closer to the electrode terminal, the assembling property is hardly impaired.

本発明に係る電池モジュールにおいては、検出端子は、電圧検出端子であってもよい。この場合、例えば、締結状態の検出に加えて、電圧等の電池セルの特性に関する情報を取得することが可能となる。 In the battery module according to the present invention, the detection terminal may be a voltage detection terminal. In this case, for example, in addition to the detection of the fastening state, it is possible to acquire information on the battery cell characteristics such as voltage.

本発明によれば、複数の締結箇所の締結状態を簡単な構成により検出可能な電池モジュールを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the battery module which can detect the fastening state of a some fastening location by simple structure can be provided.

本実施形態に係る電池モジュールの斜視図である。It is a perspective view of the battery module concerning this embodiment. 図１に示された電池モジュールの断面図である。It is sectional drawing of the battery module shown by FIG. 図２の（ａ）に示された電池モジュールの一部拡大断面図である。It is a partial expanded sectional view of the battery module shown by (a) of FIG. 図３に示された電圧検出端子の配置の変形例を示す一部拡大断面図である。FIG. 4 is a partially enlarged cross-sectional view showing a modification of the arrangement of the voltage detection terminals shown in FIG. 3. 変形例に係る電池モジュールの一部拡大断面図である。It is a partially expanded sectional view of the battery module which concerns on a modification. 変形例に係る電池モジュールの一部拡大断面図である。It is a partially expanded sectional view of the battery module which concerns on a modification. 図３に示された導電部材の変形例を示す斜視図である。It is a perspective view which shows the modification of the electrically-conductive member shown by FIG. 変形例に係る電池モジュールの一部拡大断面図である。It is a partially expanded sectional view of the battery module which concerns on a modification.

以下、本発明に係る電池モジュールの一実施形態について、図面を参照して詳細に説明する。なお、図面の説明において、同一の要素同士、或いは、相当する要素同士には、同一の符号を付し、重複する説明を省略する場合がある。 Hereinafter, an embodiment of a battery module according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements or corresponding elements may be denoted by the same reference numerals, and redundant descriptions may be omitted.

図１は、本実施形態に係る電池モジュールの斜視図である。図２は、図１に示された電池モジュールの断面図である。特に、図２の（ａ）は、図１のIIa−IIa線に沿った断面図である。また、図２の（ｂ）は、図１のIIb−IIb線に沿った部分断面図である。図１，２に示されるように、電池モジュール１は、所定の方向に沿って積層された複数（ここでは７つ）の電池セル１０と、電池セル１０のそれぞれを個別に保持する複数（ここでは７つ）のセルホルダ２０と、電池セル１０の積層方向に沿って電池セル１０を拘束する拘束部材３０と、電池セル１０に接続された複数のバスバー４１，４２，４３と、を備える。 FIG. 1 is a perspective view of the battery module according to the present embodiment. FIG. 2 is a cross-sectional view of the battery module shown in FIG. 2A is a cross-sectional view taken along the line IIa-IIa in FIG. FIG. 2B is a partial cross-sectional view taken along the line IIb-IIb in FIG. As shown in FIGS. 1 and 2, the battery module 1 includes a plurality (here, seven) of battery cells 10 stacked along a predetermined direction, and a plurality (here, each) of the battery cells 10. 7) cell holders 20, a restraining member 30 that restrains the battery cells 10 along the stacking direction of the battery cells 10, and a plurality of bus bars 41, 42, 43 connected to the battery cells 10.

電池セル１０は、リチウムイオン二次電池等の非水電解質二次電池である。電池セル１０は、直方体状を呈する中空のケース１２と、ケース１２内に収容された電極組立体１３と、を備えている。ケース１２は、例えばアルミニウム等の金属によって形成されている。ケース１２は、互いに対向する頂面１２ａ及び底面１２ｂと、互いに対向する側面１２ｃ，１２ｄと、互いに対向する側面１２ｅ，１２ｆと、を有する。側面１２ｃ，１２ｄは、電池セル１０の積層方向（所定の方向）に交差する面である。側面１２ｅ，１２ｆは、電池セル１０の積層方向に沿った面である。 The battery cell 10 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The battery cell 10 includes a hollow case 12 having a rectangular parallelepiped shape, and an electrode assembly 13 accommodated in the case 12. The case 12 is made of a metal such as aluminum. The case 12 has a top surface 12a and a bottom surface 12b facing each other, side surfaces 12c and 12d facing each other, and side surfaces 12e and 12f facing each other. The side surfaces 12 c and 12 d are surfaces that intersect the stacking direction (predetermined direction) of the battery cells 10. The side surfaces 12 e and 12 f are surfaces along the stacking direction of the battery cells 10.

ケース１２の内部には、例えば有機溶媒系又は非水系の電解液が注入されている。ケース１２の頂面１２ａには、正極端子１５と負極端子１６とが互いに離間して配置されている。正極端子１５は、絶縁リング（不図示）を介してケース１２の頂面１２ａに固定されている。負極端子１６は、絶縁リング（不図示）を介してケース１２の頂面１２ａに固定されている。つまり、電池セル１０は、ケース１２の頂面１２ａに突設された電極端子（正極端子１５及び負極端子１６）を有する。 For example, an organic solvent-based or non-aqueous electrolyte is injected into the case 12. On the top surface 12 a of the case 12, the positive electrode terminal 15 and the negative electrode terminal 16 are disposed so as to be separated from each other. The positive terminal 15 is fixed to the top surface 12a of the case 12 via an insulating ring (not shown). The negative electrode terminal 16 is fixed to the top surface 12a of the case 12 via an insulating ring (not shown). That is, the battery cell 10 has the electrode terminals (the positive electrode terminal 15 and the negative electrode terminal 16) protruding from the top surface 12 a of the case 12.

電極組立体１３は、例えば、正極１３ｐと、負極１３ｎと、正極１３ｐと負極１３ｎとの間に配置された袋状のセパレータ（不図示）と、によって構成されている。電極組立体１３においては、例えば、正極１３ｐがセパレータ内に収容されており、その状態で正極１３ｐと負極１３ｎとがセパレータを介して交互の積層されている。正極１３ｐは、タブ１３ｔ及び集電部材Ａを介して正極端子１５に接続されている。負極１３ｎは、タブ１３ｔ及び集電部材Ａを介して負極端子１６に接続されている。なお、電極組立体１３における正極１３ｐ及び負極１３ｎの積層方向は、電池セル１０の積層方向と一致している。 The electrode assembly 13 includes, for example, a positive electrode 13p, a negative electrode 13n, and a bag-like separator (not shown) disposed between the positive electrode 13p and the negative electrode 13n. In the electrode assembly 13, for example, the positive electrodes 13p are accommodated in a separator, and in this state, the positive electrodes 13p and the negative electrodes 13n are alternately stacked via the separators. The positive electrode 13p is connected to the positive electrode terminal 15 via the tab 13t and the current collecting member A. The negative electrode 13n is connected to the negative electrode terminal 16 via the tab 13t and the current collecting member A. Note that the stacking direction of the positive electrode 13p and the negative electrode 13n in the electrode assembly 13 coincides with the stacking direction of the battery cells 10.

セルホルダ２０は、互いに対向する一対の側壁部２０ｃ，２０ｄと底壁部２０ｂと、を含む。側壁部２０ｃ，２０ｄは、長方形板状を呈している。底壁部２０ｂは、長方形板状を呈しており、側壁部２０ｃ，２０ｄの長手方向の端部において側壁部２０ｃと側壁部２０ｄとを互いに接続している。側壁部２０ｃ，２０ｄは、それぞれ、電池セル１０を保持したときにケース１２の側面１２ｃ，１２ｄ上に配置される。同様に、底壁部２０ｂは、ケース１２の底面１２ｂ上に配置される。セルホルダ２０には、後述する拘束部材３０のボルト３２が挿通される複数（ここでは４つ）の貫通孔２１が設けられている。 The cell holder 20 includes a pair of side wall portions 20c and 20d and a bottom wall portion 20b that face each other. The side wall portions 20c and 20d have a rectangular plate shape. The bottom wall portion 20b has a rectangular plate shape, and connects the side wall portion 20c and the side wall portion 20d to each other at the longitudinal ends of the side wall portions 20c and 20d. The side wall portions 20c and 20d are respectively disposed on the side surfaces 12c and 12d of the case 12 when the battery cell 10 is held. Similarly, the bottom wall portion 20 b is disposed on the bottom surface 12 b of the case 12. The cell holder 20 is provided with a plurality (four in this case) of through-holes 21 through which bolts 32 of a restraining member 30 described later are inserted.

拘束部材３０は、電池セル１０の積層方向に沿って電池セル１０を拘束する。より具体的には、拘束部材３０は、一対のエンドプレート３１と、複数のボルト３２と、複数のナット３３と、を含む。エンドプレート３１は、電池セル１０の積層方向における積層体（電池セル１０の積層体）の一端部及び他端部のそれぞれに配置されている。 The restraining member 30 restrains the battery cell 10 along the stacking direction of the battery cells 10. More specifically, the restraining member 30 includes a pair of end plates 31, a plurality of bolts 32, and a plurality of nuts 33. The end plate 31 is disposed on each of one end and the other end of the stacked body (the stacked body of the battery cells 10) in the stacking direction of the battery cells 10.

ボルト３２は、電池セル１０を保持したセルホルダ２０の貫通孔２１、及び、エンドプレート３１に設けられた貫通孔に挿通される。ナット３３は、エンドプレート３１同士を互いに締め付けるようにボルト３２の端部に螺合される。これにより、エンドプレート３１を介して、電池セル１０に拘束荷重が付加される。なお、エンドプレート３１のそれぞれには、Ｌ字板状の固定部材３４が設けられている。電池モジュール１は、この固定部材３４を介して、例えば電池パックの筐体等に固定される。 The bolt 32 is inserted into the through hole 21 of the cell holder 20 that holds the battery cell 10 and the through hole provided in the end plate 31. The nut 33 is screwed onto the end of the bolt 32 so that the end plates 31 are fastened to each other. Thereby, a binding load is applied to the battery cell 10 via the end plate 31. Each end plate 31 is provided with an L-shaped fixing member 34. The battery module 1 is fixed to, for example, a battery pack housing or the like via the fixing member 34.

図３は、図２の（ａ）に示された電池モジュールの一部拡大断面図である。図１〜３に示されるように、バスバー４１は、互いに隣り合う電池セル１０の正極端子１５と負極端子１６とを電気的に接続している。これにより、電池セル１０は、互いに直列に接続される。つまり、電池モジュール１においては、電池セル１０の積層方向に沿って正極端子１５と負極端子１６とが交互に配列されるように、電池セル１０が積層されている。 FIG. 3 is a partially enlarged cross-sectional view of the battery module shown in FIG. 1 to 3, the bus bar 41 electrically connects the positive electrode terminal 15 and the negative electrode terminal 16 of the battery cells 10 adjacent to each other. Thereby, the battery cells 10 are connected in series with each other. That is, in the battery module 1, the battery cells 10 are stacked such that the positive terminals 15 and the negative terminals 16 are alternately arranged along the stacking direction of the battery cells 10.

バスバー４２は、電池モジュール１の一端部１ａに位置する電池セル１０の正極端子１５（総プラス）に電気的に接続される。正極端子１５は、例えば、バスバー４２及びハーネス（不図示）等を介して、複数の電池モジュール１を並列に接続するための端子台の正極バスバー（不図示）に電気的に接続される。 The bus bar 42 is electrically connected to the positive terminal 15 (total plus) of the battery cell 10 located at the one end 1 a of the battery module 1. The positive electrode terminal 15 is electrically connected to a positive electrode bus bar (not shown) of a terminal block for connecting the plurality of battery modules 1 in parallel via, for example, a bus bar 42 and a harness (not shown).

バスバー４３は、電池モジュール１の他端１ｂに位置する電池セル１０の負極端子１６（総マイナス）に電気的に接続される。負極端子１６は、例えばバスバー４３やハーネス（不図示）等を介して、電流センサやＦＥＴリレー、ヒューズといった電子部品に電気的に接続されると共に、複数の電池モジュール１を並列に接続するための端子台の負極バスバー（不図示）に電気的に接続される。 The bus bar 43 is electrically connected to the negative terminal 16 (total minus) of the battery cell 10 located at the other end 1b of the battery module 1. The negative electrode terminal 16 is electrically connected to an electronic component such as a current sensor, an FET relay, or a fuse via, for example, a bus bar 43 or a harness (not shown), and for connecting a plurality of battery modules 1 in parallel. It is electrically connected to a negative electrode bus bar (not shown) of the terminal block.

バスバー４２，４３は、導電部材５０及び電圧検出端子６０に電気的に接続されている。すなわち、電池モジュール１は、導電部材５０及び電圧検出端子（検出端子）６０を備える。この点について、より詳細に説明する。以下では、主に負極端子１６及びバスバー４３について説明するが、正極端子１５及びバスバー４２についても同様である。 The bus bars 42 and 43 are electrically connected to the conductive member 50 and the voltage detection terminal 60. That is, the battery module 1 includes a conductive member 50 and a voltage detection terminal (detection terminal) 60. This point will be described in more detail. Hereinafter, the negative electrode terminal 16 and the bus bar 43 will be mainly described, but the same applies to the positive electrode terminal 15 and the bus bar 42.

導電部材５０は、一端部５１及び他端部５２と、一端部５１と他端部５２との間の中間部５３と、を含む。中間部５３は、一端部５１と他端部５２とを接続する。ここでは、一端部５１、他端部５２、及び、中間部５３は、互いに一体に形成されている。一端部５１及び他端部５２は、円柱状に形成されている。一端部５１及び他端部５２の外周には、ネジ山が形成されている。すなわち、ここでは、導電部材５０の両端（一端部５１及び他端部５２）が雄ねじとなっている。中間部５３は、一端部５１及び他端部５２よりも大きな柱状（例えば六角柱状や円柱状）に形成されている。 The conductive member 50 includes one end 51 and the other end 52, and an intermediate portion 53 between the one end 51 and the other end 52. The intermediate part 53 connects the one end part 51 and the other end part 52. Here, the one end portion 51, the other end portion 52, and the intermediate portion 53 are integrally formed with each other. The one end 51 and the other end 52 are formed in a cylindrical shape. Screw threads are formed on the outer circumferences of the one end portion 51 and the other end portion 52. That is, here, both ends (one end 51 and the other end 52) of the conductive member 50 are male threads. The intermediate portion 53 is formed in a columnar shape (for example, a hexagonal columnar shape or a cylindrical shape) larger than the one end portion 51 and the other end portion 52.

中間部５３が角柱状である場合には、中間部５３の互いに対向する側面同士の間隔が、一端部５１及び他端部５２の直径よりも大きい。中間部５３が円柱状である場合には、中間部５３の直径が一端部５１及び他端部５２の直径よりも大きい。このため、一端部５１と中間部５３との間には、段差部５５が形成されている。また、他端部５２と中間部５３との間には、段差部５６が形成されている。段差部５５，５６は、中間部５３の両端面であり、導電部材５０の延在方向に沿って導電部材５０の寸法が変化する部分である。導電部材５０は、一例として、銅製の両頭ボルトである。 When the intermediate portion 53 has a prismatic shape, the distance between the side surfaces facing each other of the intermediate portion 53 is larger than the diameters of the one end portion 51 and the other end portion 52. When the intermediate portion 53 is cylindrical, the diameter of the intermediate portion 53 is larger than the diameters of the one end portion 51 and the other end portion 52. Therefore, a stepped portion 55 is formed between the one end portion 51 and the intermediate portion 53. In addition, a stepped portion 56 is formed between the other end portion 52 and the intermediate portion 53. The step portions 55 and 56 are both end surfaces of the intermediate portion 53, and are portions where the dimensions of the conductive member 50 change along the extending direction of the conductive member 50. The conductive member 50 is, for example, a copper double-ended bolt.

一端部５１は、負極端子１６に螺合されることにより負極端子１６に締結されている。より具体的には、負極端子１６は、ケース１２の内部に位置する頭部１６ａと、頭部１６ａから延びてケース１２の頂面１２ａから突出する軸部１６ｂとからなる。軸部１６ｂには、ネジ孔（第１のネジ孔）１６ｈが設けられている。一端部５１は、軸部１６ｂのネジ孔１６ｈに進入するようにネジ孔１６ｈに螺合され、負極端子１６に締結される。このとき、段差部５５は、負極端子１６の軸部１６ｂの頂部に当接する。なお、段差部５５は、軸部１６ｂに予め螺合されているナットＮの頂部には当接しない。ケース１２と負極端子１６との間、及び、ケース１２とナットＮとの間には、断面Ｕ字状の絶縁部材Ｂが介在されている。 The one end portion 51 is fastened to the negative electrode terminal 16 by being screwed to the negative electrode terminal 16. More specifically, the negative electrode terminal 16 includes a head portion 16 a located inside the case 12, and a shaft portion 16 b that extends from the head portion 16 a and protrudes from the top surface 12 a of the case 12. The shaft portion 16b is provided with a screw hole (first screw hole) 16h. The one end portion 51 is screwed into the screw hole 16 h so as to enter the screw hole 16 h of the shaft portion 16 b and is fastened to the negative electrode terminal 16. At this time, the step portion 55 abuts on the top portion of the shaft portion 16 b of the negative electrode terminal 16. Note that the stepped portion 55 does not contact the top of the nut N that is screwed in advance with the shaft portion 16b. An insulating member B having a U-shaped cross section is interposed between the case 12 and the negative electrode terminal 16 and between the case 12 and the nut N.

他端部５２は、段差部５６にバスバー４３を配置した状態において、ナット５７が螺合されることにより、バスバー４３に締結される。これにより、導電部材５０は、負極端子１６とバスバー４３との間の導電経路を形成する。なお、バスバー４３には、例えば円柱状の貫通孔４３ｈが設けられている。したがって、その貫通孔４３ｈに導電部材５０の他端部５２を挿通させることによって、バスバー４３を段差部５６上に配置することができる。 The other end 52 is fastened to the bus bar 43 when the nut 57 is screwed in a state where the bus bar 43 is disposed in the stepped portion 56. Thereby, the conductive member 50 forms a conductive path between the negative electrode terminal 16 and the bus bar 43. The bus bar 43 is provided with, for example, a cylindrical through hole 43h. Therefore, the bus bar 43 can be disposed on the stepped portion 56 by inserting the other end portion 52 of the conductive member 50 into the through hole 43h.

導電部材５０は、負極端子１６とバスバー４３との間に、中間部５３の高さに相当するスペースを形成する。導電部材５０により形成されるスペースは、例えば、各電池セル１０の正極端子１５及び負極端子１６からの配線を取り回すことに用いることができる。さらに、導電部材５０の他端部５２（段差部５６）にカバーを係止することにより、導電部材５０により形成されるスペース上に、上述した電子部品等を設置するための領域を確保することが可能となる。 The conductive member 50 forms a space corresponding to the height of the intermediate portion 53 between the negative electrode terminal 16 and the bus bar 43. The space formed by the conductive member 50 can be used, for example, for routing wiring from the positive electrode terminal 15 and the negative electrode terminal 16 of each battery cell 10. Further, by securing the cover to the other end portion 52 (stepped portion 56) of the conductive member 50, an area for installing the above-described electronic component or the like is secured on the space formed by the conductive member 50. Is possible.

電圧検出端子６０は、導電部材５０の他端部５２に締結される。より具体的には、電圧検出端子６０は、段差部５６とバスバー４３との間に介在するように、段差部５６に配置される。そして、電圧検出端子６０は、ナット５７の他端部５２への螺合により、バスバー４３と共に他端部５２に締結される。電圧検出端子６０は、例えば、電圧検出装置（例えば上記の電子部品）から延びる配線（不図示）の終端部に丸端子として構成される。したがって、ここでは、電圧検出端子６０は、他端部５２に挿通させることにより段差部５６上に配置される。 The voltage detection terminal 60 is fastened to the other end 52 of the conductive member 50. More specifically, the voltage detection terminal 60 is disposed on the stepped portion 56 so as to be interposed between the stepped portion 56 and the bus bar 43. The voltage detection terminal 60 is fastened to the other end 52 together with the bus bar 43 by screwing the nut 57 to the other end 52. The voltage detection terminal 60 is configured, for example, as a round terminal at a terminal portion of a wiring (not shown) extending from a voltage detection device (for example, the electronic component described above). Therefore, here, the voltage detection terminal 60 is disposed on the stepped portion 56 by being inserted into the other end portion 52.

以上のように、電池モジュール１にあっては、電極端子とバスバーとの接続構造において、負極端子１６と導電部材５０の一端部５１との締結、及び、導電部材５０の他端部５２とバスバー４３との締結の２箇所の締結箇所が生じる。電圧検出端子６０は、それらの２箇所の締結箇所の締結状態を検出する。すなわち、電圧検出端子６０は、負極端子１６と一端部５１との締結状態、及び、他端部５２とバスバー４３との締結状態を検出する。 As described above, in the battery module 1, in the connection structure between the electrode terminal and the bus bar, the negative electrode terminal 16 is fastened to the one end 51 of the conductive member 50, and the other end 52 of the conductive member 50 is connected to the bus bar. Two fastening points of fastening with 43 are generated. The voltage detection terminal 60 detects the fastening state of these two fastening locations. That is, the voltage detection terminal 60 detects the fastening state between the negative electrode terminal 16 and the one end 51 and the fastening state between the other end 52 and the bus bar 43.

より具体的には、電圧検出端子６０は、上述したように、段差部５６とバスバー４３との間に介在され、バスバー４３と共に他端部５２に締結されている。そして、他端部５２は、中間部５３を介して一端部５１と一体に形成されている。したがって、電圧検出端子６０は、導電部材５０の他端部５２とバスバー４３との間の締結が緩んだ場合、及び、導電部材５０の一端部５１と負極端子１６との間の締結が緩んだ場合のいずれの場合であっても、それぞれの締結箇所における接触抵抗の増加に起因して、負極端子１６からバスバー４３に至る導電経路上の電圧の上昇を検出できる。したがって、電池モジュール１においては、単一の電圧検出端子６０によって、導電部材５０の両端の締結状態を検出可能である。 More specifically, the voltage detection terminal 60 is interposed between the stepped portion 56 and the bus bar 43 and fastened to the other end portion 52 together with the bus bar 43 as described above. The other end portion 52 is formed integrally with the one end portion 51 via the intermediate portion 53. Therefore, in the voltage detection terminal 60, when the fastening between the other end portion 52 of the conductive member 50 and the bus bar 43 is loosened, and the fastening between the one end portion 51 of the conductive member 50 and the negative electrode terminal 16 is loosened. In any case, an increase in voltage on the conductive path from the negative electrode terminal 16 to the bus bar 43 can be detected due to an increase in contact resistance at each fastening point. Therefore, in the battery module 1, the fastening state of both ends of the conductive member 50 can be detected by the single voltage detection terminal 60.

以上説明したように、本実施形態に係る電池モジュール１は、負極端子１６とバスバー４３との両方に締結されることにより、負極端子１６とバスバー４３との間の導電経路を形成する導電部材５０を備えている。負極端子１６は、導電部材５０の一端部５１に締結され、バスバー４３は導電部材５０の他端部５２に締結される。したがって、負極端子１６上には、導電部材５０の中間部５３の高さに相当するスペースが形成される。つまり、導電部材５０がスペーサとして機能させられる。 As described above, the battery module 1 according to this embodiment is fastened to both the negative electrode terminal 16 and the bus bar 43, thereby forming a conductive member 50 that forms a conductive path between the negative electrode terminal 16 and the bus bar 43. It has. The negative terminal 16 is fastened to one end 51 of the conductive member 50, and the bus bar 43 is fastened to the other end 52 of the conductive member 50. Therefore, a space corresponding to the height of the intermediate portion 53 of the conductive member 50 is formed on the negative electrode terminal 16. That is, the conductive member 50 is caused to function as a spacer.

一方、負極端子１６とバスバー４３との間に導電部材５０を介在させることにより、負極端子１６と導電部材５０の一端部５１との締結、及び、導電部材５０の他端部５２とバスバー４３との締結といったように、複数の（ここでは２つ）締結箇所が生じる。これに対して、この電池モジュール１においては、それぞれの締結箇所の締結状態を検出するための電圧検出端子６０を導電部材５０の他端部５２に締結する。これにより、簡単な構成により複数の締結箇所の締結状態を検出することが可能となる。 On the other hand, by interposing the conductive member 50 between the negative electrode terminal 16 and the bus bar 43, the negative electrode terminal 16 and the one end 51 of the conductive member 50 are fastened, and the other end 52 of the conductive member 50 and the bus bar 43 are connected. A plurality of (two in this case) fastening points are generated as shown in FIG. On the other hand, in the battery module 1, the voltage detection terminal 60 for detecting the fastening state of each fastening portion is fastened to the other end 52 of the conductive member 50. Thereby, it becomes possible to detect the fastening state of a some fastening location by simple structure.

特に、本実施形態に係る電池モジュール１においては、導電部材５０の一端部５１、他端部５２、及び中間部５３が、互いに一体に形成されている。また、一端部５１は、負極端子１６に螺合されることにより負極端子１６に締結されている。さらに、他端部５２は、他端部５２と中間部５３との間の段差部５６にバスバー４３を配置した状態においてナット５７が螺合されることにより、バスバー４３に締結されている。 In particular, in the battery module 1 according to the present embodiment, the one end portion 51, the other end portion 52, and the intermediate portion 53 of the conductive member 50 are integrally formed. Further, the one end 51 is fastened to the negative electrode terminal 16 by being screwed to the negative electrode terminal 16. Further, the other end portion 52 is fastened to the bus bar 43 by screwing the nut 57 in a state where the bus bar 43 is disposed in the step portion 56 between the other end portion 52 and the intermediate portion 53.

そして、電圧検出端子６０は、段差部５６とバスバー４３との間に介在され、バスバー４３と共に他端部５２に締結されている。このため、単一の電圧検出端子６０によって、導電部材５０の一端部５１と負極端子１６との間の締結状態、及び、導電部材５０の他端部５２とバスバー４３との締結状態の両方を検出することが可能である。特に、この場合には、電圧検出端子６０がバスバー４３よりも負極端子１６側に配置される。このため、電圧検出端子６０の配線の取り回しが容易であり、組付け性が損なわれ難い。 The voltage detection terminal 60 is interposed between the step portion 56 and the bus bar 43, and is fastened to the other end portion 52 together with the bus bar 43. For this reason, both the fastening state between the one end portion 51 of the conductive member 50 and the negative electrode terminal 16 and the fastening state between the other end portion 52 of the conductive member 50 and the bus bar 43 are provided by the single voltage detection terminal 60. It is possible to detect. In particular, in this case, the voltage detection terminal 60 is disposed closer to the negative electrode terminal 16 than the bus bar 43. For this reason, the wiring of the voltage detection terminal 60 is easy to handle, and the assembling property is not easily impaired.

さらに、本実施形態に係る電池モジュール１においては、締結状態を検出するための検出端子として、電圧検出端子６０を用いている。このため、締結状態の検出に加えて、電圧等の電池セル１０の特性に関する情報を取得することが可能である。 Furthermore, in the battery module 1 according to the present embodiment, the voltage detection terminal 60 is used as a detection terminal for detecting the fastening state. For this reason, in addition to the detection of a fastening state, it is possible to acquire information regarding the characteristics of the battery cell 10 such as voltage.

以上の実施形態は、本発明に係る電池モジュールの一実施形態を説明したものである。したがって、本発明に係る電池モジュールは、上述した電池モジュール１に限定されない。本発明に係る電池モジュールは、各請求項の要旨を変更しない範囲において、上述した電池モジュール１を任意に変更可能である。 The above embodiment describes one embodiment of the battery module according to the present invention. Therefore, the battery module according to the present invention is not limited to the battery module 1 described above. In the battery module according to the present invention, the above-described battery module 1 can be arbitrarily changed without changing the gist of each claim.

図４は、図３に示された電圧検出端子の配置の変形例を示す一部拡大断面図である。図４に示されるように、電圧検出端子６０を、バスバー４３とナット５７との間に介在させてもよい。このように、バスバー４３とナット５７との間に電圧検出端子６０を介在させても、上述した場合と同様の理由から、単一の電圧検出端子６０によって、導電部材５０の一端部５１と負極端子１６との間の締結状態、及び、導電部材５０の他端部５２とバスバー４３との締結状態の両方を検出することが可能である。特に、この場合には、電圧検出端子６０がバスバー４３よりも負極端子１６から離れて配置される。このため、電圧検出端子６０が、負極端子１６とバスバー４３との間の導電経路に影響を及ぼし難い。 FIG. 4 is a partially enlarged cross-sectional view showing a modified example of the arrangement of the voltage detection terminals shown in FIG. As shown in FIG. 4, the voltage detection terminal 60 may be interposed between the bus bar 43 and the nut 57. Thus, even if the voltage detection terminal 60 is interposed between the bus bar 43 and the nut 57, for the same reason as described above, the one end 51 of the conductive member 50 and the negative electrode are separated by the single voltage detection terminal 60. It is possible to detect both the fastening state between the terminal 16 and the fastening state between the other end portion 52 of the conductive member 50 and the bus bar 43. In particular, in this case, the voltage detection terminal 60 is arranged farther from the negative electrode terminal 16 than the bus bar 43. For this reason, the voltage detection terminal 60 hardly affects the conductive path between the negative electrode terminal 16 and the bus bar 43.

また、電池モジュール１は、導電部材５０に代えて、図５に示される導電部材５０Ａを備える電池モジュール１Ａとすることができる。導電部材５０Ａは、一端部５１及び他端部５２と、一端部５１と他端部５２との間の中間部５３と、を含む。中間部５３は、一端部５１と他端部５２とを接続する。ここでも、一端部５１、他端部５２、及び、中間部５３は、互いに一体に形成されている。一例として、ここでは、一端部５１、他端部５２、及び、中間部５３は、互いに実質的に同一の外形を有する。したがって、ここでは、一端部５１及び他端部５２と中間部５３との間には段差部が形成されていない。導電部材５０Ａは、全体として、例えば六角柱等の柱状に形成されている。 Further, the battery module 1 may be a battery module 1A including the conductive member 50A shown in FIG. The conductive member 50 A includes one end 51 and the other end 52, and an intermediate portion 53 between the one end 51 and the other end 52. The intermediate part 53 connects the one end part 51 and the other end part 52. Here, the one end portion 51, the other end portion 52, and the intermediate portion 53 are integrally formed with each other. As an example, here, the one end portion 51, the other end portion 52, and the intermediate portion 53 have substantially the same outer shape. Therefore, here, no stepped portion is formed between the one end portion 51 and the other end portion 52 and the intermediate portion 53. As a whole, the conductive member 50A is formed in a column shape such as a hexagonal column.

一端部５１は、負極端子１６に螺合されることにより負極端子１６に締結されている。より具体的には、導電部材５０Ａの一端部５１側の端面（一端面）５１ｓには、ネジ孔（第２のネジ孔）５１ｈが形成されている。また、負極端子１６の軸部１６ｂの外周にはネジ山が形成されている。そして、一端部５１は、ネジ孔５１ｈに負極端子１６の軸部１６ｂが進入するように、ネジ孔５１ｈに負極端子１６が螺合されることにより、負極端子１６に締結されている。 The one end portion 51 is fastened to the negative electrode terminal 16 by being screwed to the negative electrode terminal 16. More specifically, a screw hole (second screw hole) 51h is formed in the end surface (one end surface) 51s on the one end 51 side of the conductive member 50A. Further, a screw thread is formed on the outer periphery of the shaft portion 16 b of the negative electrode terminal 16. The one end portion 51 is fastened to the negative electrode terminal 16 by screwing the negative electrode terminal 16 into the screw hole 51h so that the shaft portion 16b of the negative electrode terminal 16 enters the screw hole 51h.

一方、導電部材５０Ａの他端部５２側の端面（他端面）５２ｓには、ネジ孔（第３のネジ孔）５２ｈが形成されている。したがって、ここでは、導電部材５０Ａの両端（一端部５１及び他端部５２）が雌ネジとなっている。そして、他端部５２は、端面５２ｓ上にバスバー４３を配置した状態において、ネジ孔５２ｈにボルト５７Ａが螺合されることにより、バスバー４３に締結されている。これにより、導電部材５０Ａは、負極端子１６とバスバー４３との間の導電経路を形成する。なお、ボルト５７Ａの軸部５７ｂは、端面５２ｓ上に配置されたバスバー４３の貫通孔４３ｈに挿通されてネジ孔５２ｈに進入する。これにより、ボルト５７Ａの頭部５７ａと端面５２ｓとの間にバスバー４３が挟持されるように、他端部５２がバスバー４３に締結される。 On the other hand, a screw hole (third screw hole) 52h is formed in the end surface (other end surface) 52s on the other end 52 side of the conductive member 50A. Therefore, here, both ends (one end 51 and the other end 52) of the conductive member 50A are female screws. The other end 52 is fastened to the bus bar 43 by screwing a bolt 57A into the screw hole 52h in a state where the bus bar 43 is disposed on the end surface 52s. Thereby, the conductive member 50 A forms a conductive path between the negative electrode terminal 16 and the bus bar 43. The shaft portion 57b of the bolt 57A is inserted through the through hole 43h of the bus bar 43 disposed on the end surface 52s and enters the screw hole 52h. Accordingly, the other end 52 is fastened to the bus bar 43 so that the bus bar 43 is sandwiched between the head 57a of the bolt 57A and the end surface 52s.

電圧検出端子６０は、バスバー４３と端面５２ｓとの間に介在され、他端部５２に締結される。より具体的には、電圧検出端子６０は、バスバー４３と端面５２ｓとの間に介在するように、端面５２ｓ上に配置される。そして、電圧検出端子６０は、ボルト５７Ａの他端部５２への螺合により、バスバー４３と共に他端部５２に締結される。 The voltage detection terminal 60 is interposed between the bus bar 43 and the end surface 52 s and is fastened to the other end 52. More specifically, the voltage detection terminal 60 is disposed on the end surface 52s so as to be interposed between the bus bar 43 and the end surface 52s. The voltage detection terminal 60 is fastened to the other end 52 together with the bus bar 43 by screwing the bolt 57A to the other end 52.

以上の電池モジュール１Ａのように、導電部材５０Ａの一端部５１及び他端部５２を雌ネジとした場合であっても、導電部材５０Ａの他端部５２側の端面５２ｓとバスバー４３との間に電圧検出端子６０を介在させれば、単一の電圧検出端子６０によって、導電部材５０Ａの一端部５１と負極端子１６との間の締結状態、及び、導電部材５０Ａの他端部５２とバスバー４３との締結状態の両方を検出することが可能である。特に、電圧検出端子６０がバスバー４３よりも負極端子１６側に配置されるので、電圧検出端子６０の配線の取り回しが容易であり、組付け性が損なわれ難い。 Even when the one end 51 and the other end 52 of the conductive member 50A are female screws as in the battery module 1A described above, the gap between the end face 52s on the other end 52 side of the conductive member 50A and the bus bar 43 is between. If the voltage detection terminal 60 is interposed between the one end 51 and the negative terminal 16 of the conductive member 50A, and the other end 52 and the bus bar of the conductive member 50A. It is possible to detect both the fastening state with 43. In particular, since the voltage detection terminal 60 is disposed closer to the negative electrode terminal 16 than the bus bar 43, the wiring of the voltage detection terminal 60 can be easily routed, and the assembling property is not easily impaired.

ここで、電池モジュール１は、導電部材５０に代えて、図６に示される導電部材５０Ｂを備える電池モジュール１Ｂとすることができる。導電部材５０Ｂにおいては、一端部５１が導電部材５０Ａと同様に雌ネジとされ、他端部５２が導電部材５０と同様に雄ネジとされている。より具体的には、導電部材５０Ｂの一端部５１側の端面５１ｓには、ネジ孔５１ｈが形成されている。そして、一端部５１は、ネジ孔５１ｈに負極端子１６の軸部１６ｂが進入するように、ネジ孔５１ｈに負極端子１６が螺合されることにより、負極端子１６に締結されている。 Here, the battery module 1 can be a battery module 1B including the conductive member 50B shown in FIG. In the conductive member 50 B, one end 51 is a female screw similarly to the conductive member 50 A, and the other end 52 is a male screw similar to the conductive member 50. More specifically, a screw hole 51h is formed in the end surface 51s on the one end 51 side of the conductive member 50B. The one end portion 51 is fastened to the negative electrode terminal 16 by screwing the negative electrode terminal 16 into the screw hole 51h so that the shaft portion 16b of the negative electrode terminal 16 enters the screw hole 51h.

一方、導電部材５０Ｂにおいては、他端部５２は、中間部５３よりも小さい円柱状に形成されている。他端部５２の外周にはネジ山が形成されている。他端部５２は、段差部５６にバスバー４３を配置した状態において、ナット５７が螺合されることにより、バスバー４３に締結される。これにより、導電部材５０Ｂは、負極端子１６とバスバー４３との間の導電経路を形成する。電圧検出端子６０は、導電部材５０Ｂの他端部５２に締結される。より具体的には、電圧検出端子６０は、段差部５６とバスバー４３との間に介在するように、段差部５６に配置される。そして、電圧検出端子６０は、ナット５７の他端部５２への螺合により、バスバー４３と共に他端部５２に締結される。 On the other hand, in the conductive member 50 B, the other end portion 52 is formed in a columnar shape smaller than the intermediate portion 53. A thread is formed on the outer periphery of the other end 52. The other end 52 is fastened to the bus bar 43 when the nut 57 is screwed in a state where the bus bar 43 is disposed in the stepped portion 56. Thereby, the conductive member 50 B forms a conductive path between the negative electrode terminal 16 and the bus bar 43. The voltage detection terminal 60 is fastened to the other end 52 of the conductive member 50B. More specifically, the voltage detection terminal 60 is disposed on the stepped portion 56 so as to be interposed between the stepped portion 56 and the bus bar 43. The voltage detection terminal 60 is fastened to the other end 52 together with the bus bar 43 by screwing the nut 57 to the other end 52.

以上の電池モジュール１Ｂのように、導電部材５０Ｂの一端部５１を雌ネジとし、他端部５２を雄ネジとした場合であっても、導電部材５０Ｂの他端部５２側の端面５２ｓとバスバー４３との間に電圧検出端子６０を介在させれば、単一の電圧検出端子６０によって、導電部材５０Ｂの一端部５１と負極端子１６との間の締結状態、及び、導電部材５０Ｂの他端部５２とバスバー４３との締結状態の両方を検出することが可能である。特に、電圧検出端子６０がバスバー４３よりも負極端子１６側に配置されるので、電圧検出端子６０の配線の取り回しが容易であり、組付け性が損なわれ難い。 As in the battery module 1B described above, even if the one end 51 of the conductive member 50B is a female screw and the other end 52 is a male screw, the end face 52s on the other end 52 side of the conductive member 50B and the bus bar. If the voltage detection terminal 60 is interposed between the first and second terminals 43, the single voltage detection terminal 60 can be used to connect the one end 51 of the conductive member 50B to the negative terminal 16 and the other end of the conductive member 50B. It is possible to detect both the fastening state of the part 52 and the bus bar 43. In particular, since the voltage detection terminal 60 is disposed closer to the negative electrode terminal 16 than the bus bar 43, the wiring of the voltage detection terminal 60 can be easily routed, and the assembling property is not easily impaired.

なお、電池モジュール１Ａ，１Ｂにおいては、電圧検出端子６０を、図４に示される変形例のように、バスバー４３とナット５７（又はボルト５７Ａの頭部５７ａ）との間に介在させてもよい。この場合には、電圧検出端子６０がバスバー４３よりも負極端子１６から離れて配置される。このため、電圧検出端子６０が、負極端子１６とバスバー４３との間の導電経路に影響を及ぼし難い。 In the battery modules 1A and 1B, the voltage detection terminal 60 may be interposed between the bus bar 43 and the nut 57 (or the head 57a of the bolt 57A) as in the modification shown in FIG. . In this case, the voltage detection terminal 60 is arranged farther from the negative electrode terminal 16 than the bus bar 43. For this reason, the voltage detection terminal 60 hardly affects the conductive path between the negative electrode terminal 16 and the bus bar 43.

さらに、電池モジュール１においては、導電部材５０の一端部５１を雄ネジとしつつ、導電部材５０の他端部５２を導電部材５０Ａと同様に雌ネジとしてもよい。 Further, in the battery module 1, the one end portion 51 of the conductive member 50 may be a male screw, and the other end portion 52 of the conductive member 50 may be a female screw similarly to the conductive member 50A.

ここで、電池モジュール１は、導電部材５０に代えて、図７及び図８に示される導電部材５０Ｃを備える電池モジュール１Ｃとすることができる。導電部材５０Ｃは、円柱状の棒状部材５８と筒状部材５９とを組み合わせて構成される。棒状部材５８は、長尺状を呈しており、その長手方向の端部のそれぞれにおいて一端部５１及び他端部５２を構成する。すなわち、棒状部材５８は、外周にネジ山が形成された一端部５１及び他端部５２と、一端部５１と他端部５２とを接続する接続部５１ｃと、からなる。一例として、接続部５１ｃにはネジ山が設けられていない。 Here, the battery module 1 may be a battery module 1C including the conductive member 50C shown in FIGS. 7 and 8 instead of the conductive member 50. The conductive member 50 C is configured by combining a cylindrical rod-shaped member 58 and a cylindrical member 59. The rod-shaped member 58 has a long shape, and constitutes one end 51 and the other end 52 at each end in the longitudinal direction. That is, the rod-shaped member 58 includes one end 51 and the other end 52 each having a thread formed on the outer periphery, and a connecting portion 51 c that connects the one end 51 and the other end 52. As an example, the connecting portion 51c is not provided with a thread.

筒状部材５９は、一例として、六角柱に円柱状の貫通孔５３ｈを形成して得られる筒状を呈している。筒状部材５９は、棒状部材５８（一端部５１、他端部５２、及び接続部４１ｃ）よりも大きな柱状に形成された中間部５３を構成する。すなわち、筒状部材５９の互いに対向する側面同士の間隔が、棒状部材５８の直径よりも大きい。導電部材５０Ａは、筒状部材５９の貫通孔５３ｈに棒状部材５８を挿通することにより構成される。ここで、貫通孔５３ｈの内径は、棒状部材５８の外径よりも大きい。したがって、棒状部材５８は、棒状部材５８の延在方向に沿って筒状部材５９に対して移動可能なように筒状部材５９の貫通孔５３ｈに挿通される。 As an example, the cylindrical member 59 has a cylindrical shape obtained by forming a cylindrical through hole 53h in a hexagonal column. The cylindrical member 59 constitutes an intermediate portion 53 formed in a columnar shape larger than the rod-shaped member 58 (one end portion 51, the other end portion 52, and the connection portion 41c). That is, the interval between the mutually opposing side surfaces of the cylindrical member 59 is larger than the diameter of the rod-shaped member 58. The conductive member 50 A is configured by inserting the rod-shaped member 58 through the through hole 53 h of the cylindrical member 59. Here, the inner diameter of the through hole 53 h is larger than the outer diameter of the rod-shaped member 58. Therefore, the rod-shaped member 58 is inserted through the through hole 53 h of the tubular member 59 so as to be movable with respect to the tubular member 59 along the extending direction of the rod-shaped member 58.

ここでも、導電部材５０Ｃは、導電部材５０と同様に、一端部５１が負極端子１６に締結されると共に他端部５２がバスバー４３に締結される。ただし、電圧検出端子６０は、導電部材５０Ｃにおける段差部５５と負極端子１６との間に介在される。より具体的には、電圧検出端子６０は、負極端子１６の軸部１６ｂの頂部と段差部５５との間に介在される。 Here, similarly to the conductive member 50, the conductive member 50 C has one end 51 fastened to the negative terminal 16 and the other end 52 fastened to the bus bar 43. However, the voltage detection terminal 60 is interposed between the step portion 55 and the negative electrode terminal 16 in the conductive member 50C. More specifically, the voltage detection terminal 60 is interposed between the top portion of the shaft portion 16 b of the negative electrode terminal 16 and the step portion 55.

この場合には、電圧検出端子６０は、導電部材５０Ｃ（棒状部材５８）の一端部５１と負極端子１６との締結が緩んだ場合には、段差部５５と負極端子１６との接触抵抗の増加に起因した電圧の上昇を検出できる。さらに、この場合には、例えばナット５７の他端部５２への螺合が緩むことにより、バスバー４３と他端部５２との間の締結に緩みが生じると、その緩みにより段差部５５の負極端子１６への押圧力が減少する。したがって、その場合にも、電圧検出端子６０は、段差部５５と負極端子１６との接触抵抗の増加に起因した電圧の上昇を検出できる。 In this case, the voltage detection terminal 60 increases the contact resistance between the stepped portion 55 and the negative electrode terminal 16 when the fastening between the one end portion 51 of the conductive member 50C (rod-shaped member 58) and the negative electrode terminal 16 is loosened. It is possible to detect a rise in voltage due to. Further, in this case, for example, when the screw 57 is loosely engaged with the other end 52 and loosening occurs between the bus bar 43 and the other end 52, the loosening causes the negative electrode of the step 55. The pressing force on the terminal 16 is reduced. Therefore, in this case as well, the voltage detection terminal 60 can detect an increase in voltage due to an increase in contact resistance between the step portion 55 and the negative electrode terminal 16.

つまり、電池モジュール１Ｃにおいても、単一の電圧検出端子６０によって、導電部材５０Ｃの一端部５１と負極端子１６との間の締結状態、及び、導電部材５０Ｃの他端部５２とバスバー４３との締結状態の両方を検出することが可能である。特に、この場合には、電圧検出端子６０がより負極端子１６に近い位置に配置されるので、組付け性がより損なわれ難い。 That is, also in the battery module 1 C, a single voltage detection terminal 60 is used to connect the one end portion 51 of the conductive member 50 C to the negative electrode terminal 16 and the other end portion 52 of the conductive member 50 C and the bus bar 43. It is possible to detect both fastening states. In particular, in this case, since the voltage detection terminal 60 is disposed at a position closer to the negative electrode terminal 16, the assemblability is hardly impaired.

また、電池モジュール１Ｃにおいては、導電部材５０Ｃの棒状部材５８によって、負極端子１６とバスバー４３との間の締結を実現しつつ、導電部材５０Ｃの筒状部材５９によって、負極端子１６とバスバー４３との間の導電経路を形成可能である。つまり、棒状部材５８を締結の強度が確保可能な材料（例えば鉄）により構成する一方で、筒状部材５９を導電性の高い材料（例えば銅）により構成することが可能となる。 Further, in the battery module 1C, the rod-shaped member 58 of the conductive member 50C realizes fastening between the negative electrode terminal 16 and the bus bar 43, while the negative electrode terminal 16 and the bus bar 43 are connected by the cylindrical member 59 of the conductive member 50C. A conductive path between the two can be formed. That is, while the rod-shaped member 58 is made of a material (for example, iron) that can secure the fastening strength, the cylindrical member 59 can be made of a highly conductive material (for example, copper).

なお、電池モジュール１Ｃにおいても、電圧検出端子６０を介在させる位置を変更してもよい。すなわち、電池モジュール１Ｃにおいても、段差部５６とバスバー４３との間やバスバー４３とナット５７との間に電圧検出端子６０を介在させてもよい。 In the battery module 1C, the position where the voltage detection terminal 60 is interposed may be changed. That is, also in the battery module 1 C, the voltage detection terminal 60 may be interposed between the stepped portion 56 and the bus bar 43 or between the bus bar 43 and the nut 57.

また、上述したように、以上の構成を正極端子１５とバスバー４２との間に同様に適用することができる。また、以上の構成を、電池モジュール１〜１Ｃの内側の位置する他の電池セル１０の正極端子１５及び負極端子１６とバスバー４１との間に同様に適用してもよい。さらに、電池モジュール１〜１Ｃにおいては、電圧検出端子６０に代えて、圧力センサ等の締結状態を検出可能な他の検出端子を用いることができる。 Further, as described above, the above configuration can be similarly applied between the positive electrode terminal 15 and the bus bar 42. Further, the above configuration may be similarly applied between the positive electrode terminal 15 and the negative electrode terminal 16 and the bus bar 41 of the other battery cell 10 located inside the battery modules 1 to 1C. Furthermore, in the battery modules 1 to 1C, instead of the voltage detection terminal 60, another detection terminal capable of detecting the fastening state such as a pressure sensor can be used.

１，１Ａ，１Ｂ，１Ｃ…電池モジュール、１０…電池セル、１５…正極端子（電極端子）、１６…負極端子（電極端子）、４１，４２，４３…バスバー、５０，５０Ａ，５０Ｂ，５０Ｃ…導電部材、５１…一端部、５１ｈ…ネジ孔（第２のネジ孔）、５１ｓ…端面（一端面）、５２…他端部、５２ｈ…ネジ孔（第３のネジ孔）、５２ｓ…端面（他端面）、５３…中間部、５５，５６…段差部、５７…ナット、５７Ａ…ボルト、５７ａ…頭部、５８…棒状部材、５９…筒状部材、６０…電圧検出端子（検出端子）。 DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Battery module, 10 ... Battery cell, 15 ... Positive electrode terminal (electrode terminal), 16 ... Negative electrode terminal (electrode terminal), 41, 42, 43 ... Bus bar, 50, 50A, 50B, 50C ... Conductive member, 51 ... one end, 51h ... screw hole (second screw hole), 51s ... end face (one end face), 52 ... other end, 52h ... screw hole (third screw hole), 52s ... end face ( Other end surface), 53 ... Intermediate part, 55, 56 ... Step part, 57 ... Nut, 57A ... Bolt, 57a ... Head, 58 ... Bar-like member, 59 ... Cylindrical member, 60 ... Voltage detection terminal (detection terminal).

Claims

A battery cell with protruding electrode terminals;
A bus bar electrically connected to the electrode terminal;
One end portion and the other end portion, and an intermediate portion between the one end portion and the other end portion, and fastened to the electrode terminal at the one end portion and fastened to the bus bar at the other end portion. A conductive member that forms a conductive path between the electrode terminal and the bus bar;
Fastened to the one end or the other end, a fastening state between the electrode terminal and the one end, and a detection terminal for detecting a fastening state between the other end and the bus bar,
Bei to give a,
The other end is formed in a columnar shape,
The intermediate part is formed in a larger column shape than the other end part,
The one end portion, the other end portion, and the intermediate portion are integrally formed with each other,
The other end portion is fastened to the bus bar by screwing a nut in a state where the bus bar is disposed in a step portion between the other end portion and the intermediate portion,
The detection terminal is interposed between the stepped portion and the bus bar;
Battery module.

A battery cell with protruding electrode terminals;
A bus bar electrically connected to the electrode terminal;
One end portion and the other end portion, and an intermediate portion between the one end portion and the other end portion, and fastened to the electrode terminal at the one end portion and fastened to the bus bar at the other end portion. A conductive member that forms a conductive path between the electrode terminal and the bus bar;
Fastened to the one end or the other end, a fastening state between the electrode terminal and the one end, and a detection terminal for detecting a fastening state between the other end and the bus bar,
With
The other end is formed in a columnar shape,
The intermediate part is formed in a larger column shape than the other end part,
The one end portion, the other end portion, and the intermediate portion are integrally formed with each other,
The other end portion is fastened to the bus bar by screwing a nut in a state where the bus bar is disposed in a step portion between the other end portion and the intermediate portion,
The detection terminal is interposed between the bus bar and the nut;
Battery module.

A first screw hole is formed in the electrode terminal,
The one end is fastened to the electrode terminal by being screwed into the first screw hole.
The battery module according to claim 1 or 2 .

A second screw hole is formed on one end surface of the one end side of the conductive member,
The one end is fastened to the electrode terminal by screwing the electrode terminal into the second screw hole.
The battery module according to claim 1 or 2 .

A battery cell with protruding electrode terminals;
A bus bar electrically connected to the electrode terminal;
One end portion and the other end portion, and an intermediate portion between the one end portion and the other end portion, and fastened to the electrode terminal at the one end portion and fastened to the bus bar at the other end portion. A conductive member that forms a conductive path between the electrode terminal and the bus bar;
Fastened to the one end or the other end, a fastening state between the electrode terminal and the one end, and a detection terminal for detecting a fastening state between the other end and the bus bar,
With
A second screw hole is formed on one end surface of the one end side of the conductive member,
A third screw hole is formed on the other end surface of the conductive member on the other end side,
The one end portion, the other end portion, and the intermediate portion are integrally formed with each other,
The one end is fastened to the electrode terminal by screwing the electrode terminal into the second screw hole,
The other end is fastened to the bus bar by screwing a bolt into the third screw hole in a state where the bus bar is disposed on the other end surface,
The detection terminal is interposed between the bus bar and the other end surface,
Battery module.

A battery cell with protruding electrode terminals;
A bus bar electrically connected to the electrode terminal;
One end portion and the other end portion, and an intermediate portion between the one end portion and the other end portion, and fastened to the electrode terminal at the one end portion and fastened to the bus bar at the other end portion. A conductive member that forms a conductive path between the electrode terminal and the bus bar;
Fastened to the one end or the other end, a fastening state between the electrode terminal and the one end, and a detection terminal for detecting a fastening state between the other end and the bus bar,
With
A second screw hole is formed on one end surface of the one end side of the conductive member,
A third screw hole is formed on the other end surface of the conductive member on the other end side,
The one end portion, the other end portion, and the intermediate portion are integrally formed with each other,
The one end is fastened to the electrode terminal by screwing the electrode terminal into the second screw hole,
The other end is fastened to the bus bar by screwing a bolt into the third screw hole in a state where the bus bar is disposed on the other end surface,
The detection terminal is interposed between the bus bar and the head of the bolt,
Battery module.

A battery cell with protruding electrode terminals;
A bus bar electrically connected to the electrode terminal;
One end portion and the other end portion, and an intermediate portion between the one end portion and the other end portion, and fastened to the electrode terminal at the one end portion and fastened to the bus bar at the other end portion. A conductive member that forms a conductive path between the electrode terminal and the bus bar;
Fastened to the one end or the other end, a fastening state between the electrode terminal and the one end, and a detection terminal for detecting a fastening state between the other end and the bus bar,
With
The conductive member includes a cylindrical member that constitutes the intermediate portion, and a rod-like member that constitutes the one end portion and the other end portion and is inserted through the cylindrical member.
Battery module.

The rod-shaped member is inserted through the tubular member so as to be movable with respect to the tubular member along the extending direction of the rod-shaped member,
The other end portion is fastened to the bus bar by screwing a nut in a state where the bus bar is disposed in a step portion between the other end portion and the intermediate portion,
The detection terminal is interposed between the step portion between the one end portion and the intermediate portion and the electrode terminal.
The battery module according to claim 7 .

The detection terminal is a voltage detection terminal.
The battery module as described in any one of Claims 1-8 .